logo

TechCodeview

C++で2つの文字列を連結するにはどうすればよいですか?

このセクションでは、C++ プログラミング言語における 2 つ以上の文字列の連結について説明します。文字列の連結とは、さらに 2 つの文字列を結合して、連結された 1 つの文字列を返す文字のグループを意味します。文字列を連結する際、2 番目の文字列が最初の文字列の末尾に追加されて 1 つの文字列が作成されます。

たとえば、「」という 2 つの文字列があります。 ジャワ ' そして ' Tポイント ' そして、Java + Tpoint = JavaTpoint として単一の文字列を作成するために連結したいとします。

C++で2つの文字列を連結する方法

C++ プログラミング言語で指定された文字列を連結するさまざまな方法について説明します。

  1. for ループを使用して 2 つの文字列を連結します
  2. while ループを使用して 2 つの文字列を連結する
  3. + 演算子を使用して 2 つの文字列を連結します
  4. strcat() 関数を使用して 2 つの文字列を連結する
  5. append() 関数を使用して 2 つの文字列を連結する
  6. 継承を使用して 2 つの文字列を連結する
  7. friends 関数と strcat() 関数を使用して 2 つの文字列を連結します

forループを使って2つの文字列を連結するプログラム

C++ プログラミングで for ループを使用して 2 つの文字列を結合する例を考えてみましょう。

プログラム.cpp 

 #include using namespace std; int main () { string str1, str2, result; // declare string variables int i; cout &lt;&gt; str1; // take string cout &lt;&gt; str2; // take second string // use for loop to enter the characters of the str1 into result string for ( i = 0; i <str1.size(); i++) { result="result" + str1[i]; add character of the str1 into } use for loop to enter characters str2 string ( i="0;" < str2.size(); str2[i]; cout << ' concatenation and is <<result; return 0; pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Java Enter the second string: Tpoint The Concatenation of the string Java and Tpoint is JavaTpoint </pre> <h3>Program to concatenate two strings using while loop</h3> <p>Let&apos;s consider an example to combine two strings using a while loop in C++ programming.</p> <p> <strong>Program2.cpp</strong> </p> <pre> #include using namespace std; int main () { // declare and initialize the string char str1[100] = &apos; We Love&apos;; char str2[100] = &apos; C++ Programming Language&apos;; int i, j; // declare variable cout &lt;&lt; &apos; The first string is: &apos; &lt;&lt; str1 &lt;&lt; endl; cout &lt;&lt; &apos; The second string is: &apos;&lt;&lt; str2 &lt;<endl; for (i="0;" str1[i] !="" ; i++); j="0;" initialize with 0; use while loop that insert the str2 characters in str1 (str2[j] ) check is not equal to null { assign character of i++; j++; } cout << ' concatenated string is: str1; return < pre> <p> <strong>Output</strong> </p> <pre> The first string is: We Love The second string is: C++ Programming Language The concatenated string is: We Love C++ Programming Language </pre> <h3>Program to concatenate two strings using the + operator in C++</h3> <p> <strong>+ Operator:</strong> It is an arithmetic &apos;+&apos;operator that simply adds two strings to return a new concatenated string.</p> <p>Let&apos;s consider an example to combine two strings using the + operator in C++ programming.</p> <p> <strong>Program3.cpp</strong> </p> <pre> #include using namespace std; int main () { string str1, str2; // declare string variables cout &lt;&gt; str1; cout &lt;&gt; str2; // use &apos;+&apos; operator to concatenate the str1 and str2 string result = str1 + str2; cout &lt;&lt; &apos; The concatenated string &apos; &lt;&lt; str1 &lt;&lt; &apos; and &apos; &lt;&lt; str2 &lt;<' is: ' << result; return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Java Enter the second string: Tpoint The concatenated string Java and Tpoint is: JavaTpoint </pre> <h3>Program to concatenate two strings using the strcat() method</h3> <p> <strong>strcat() function:</strong> The strcat is an inbuilt function of the string class, which adds two character strings to return a concatenated string.</p> <p> <strong>Syntax</strong> </p> <pre> strcat ( char *arr1, char *arr2) </pre> <p>There are two character arrays in the above syntax, arr1 and arr2, which passed inside the strcat() function to return a concatenated string.</p> <p>Let&apos;s consider an example to combine two strings using strcat() function in the C++ programming.</p> <p> <strong>Program4.cpp</strong> </p> <pre> #include #include using namespace std; int main() { // declare and initialize the string char str1[] = &apos; We love&apos;; char str2[] = &apos; C++ Programming&apos;; cout &lt;&lt; &apos; String 1: &apos; &lt;<str1 <<endl; cout << ' string 2: <<str2 use the strcat() function to concatenate strcat(str1, str2); concatenated is: <<str1; return 0; } < pre> <p> <strong>Output</strong> </p> <pre> String 1: We love String 2: C++ Programming The concatenated string is: We love C++ Programming </pre> <h3>Program to concatenate two strings using the append function</h3> <p> <strong>append() function:</strong> An <strong>append()</strong> function is a predefined library function used to insert or add a second string at the end of the first string to return a single string.</p> <p> <strong>Syntax</strong> </p> <pre> str1.append(str2); </pre> <p>In the above syntax, the str2 is a second string to pass in the append() function that inserts the str2 string at the end of the str1 string.</p> <p>Let&apos;s consider an example to combine two strings using append() function in the C++ programming.</p> <p> <strong>Program5.cpp</strong> </p> <pre> #include using namespace std; int main () { string str1, str2, result; // declare string variables cout &lt;&gt; str1; // take string cout &lt;&gt; str2; // take second string // use append() function to insert element at the end of the str1 str1.append(str2); cout &lt;&lt; &apos; 
 The concatenation of the string is: &apos;&lt;&lt; str1; return 0; } </pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Hello Enter the second string: Friends! The concatenation of the string is: HelloFriends! </pre> <h3>Program to concatenate two string using the inheritance of the class</h3> <p>Let&apos;s consider an example to combine two strings using inheritance in the C++ programming.</p> <p> <strong>Program6.cpp</strong> </p> <pre> #include #include using namespace std; // create base class class base { protected: virtual string concatenate(string &amp;str1, string &amp;str2) = 0; }; // create derive class to acquire features of base class class derive: protected base { public: string concatenate (string &amp;str1, string &amp;str2) { string temp; temp = str1 + str2; return temp; } }; int main() { // declare variable string str1, str2; cout &lt;&gt;str1; cout &lt;&gt;str2; // create string object derive obj; // print string cout &lt;<' 
 the concatenated string is: ' << obj.concatenate (str1, str2); return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter first string: C++ Enter second string: Programming The concatenated string is: C++Programming </pre> <h3>Program to concatenate two strings using the friend function and strcat() function</h3> <p>Let&apos;s consider an example to combine two strings using friend function and strcat() function in the C++ programming.</p> <p> <strong>Program7.cpp</strong> </p> <pre> #include #include using namespace std; class Base { private: char st[100], st2[100]; public: void inp() { cout &lt;<' 100 enter the first string: '; cin.getline (st, 100); take a line of string with limit cout <<' second (st2, friend void myfun(base b); }; myfun (base b) { strcat (b.st, b.st2); pass parameter to concatenate concatenated ' < <b.st; } int main() base b; create b as an object b.inp(); call inp() function myfun(b); myfun() print return 0; pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: javatpoint Enter the second string: .com The concatenated string: javatpoint.com </pre> <hr></'></pre></'></pre></str1></pre></'></pre></endl;></pre></str1.size();>

while ループを使用して 2 つの文字列を連結するプログラム

C++ プログラミングで while ループを使用して 2 つの文字列を結合する例を考えてみましょう。

プログラム2.cpp 

 #include using namespace std; int main () { // declare and initialize the string char str1[100] = &apos; We Love&apos;; char str2[100] = &apos; C++ Programming Language&apos;; int i, j; // declare variable cout &lt;&lt; &apos; The first string is: &apos; &lt;&lt; str1 &lt;&lt; endl; cout &lt;&lt; &apos; The second string is: &apos;&lt;&lt; str2 &lt;<endl; for (i="0;" str1[i] !="" ; i++); j="0;" initialize with 0; use while loop that insert the str2 characters in str1 (str2[j] ) check is not equal to null { assign character of i++; j++; } cout << \' concatenated string is: str1; return < pre> <p> <strong>Output</strong> </p> <pre> The first string is: We Love The second string is: C++ Programming Language The concatenated string is: We Love C++ Programming Language </pre> <h3>Program to concatenate two strings using the + operator in C++</h3> <p> <strong>+ Operator:</strong> It is an arithmetic &apos;+&apos;operator that simply adds two strings to return a new concatenated string.</p> <p>Let&apos;s consider an example to combine two strings using the + operator in C++ programming.</p> <p> <strong>Program3.cpp</strong> </p> <pre> #include using namespace std; int main () { string str1, str2; // declare string variables cout &lt;&gt; str1; cout &lt;&gt; str2; // use &apos;+&apos; operator to concatenate the str1 and str2 string result = str1 + str2; cout &lt;&lt; &apos; The concatenated string &apos; &lt;&lt; str1 &lt;&lt; &apos; and &apos; &lt;&lt; str2 &lt;<\' is: \' << result; return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Java Enter the second string: Tpoint The concatenated string Java and Tpoint is: JavaTpoint </pre> <h3>Program to concatenate two strings using the strcat() method</h3> <p> <strong>strcat() function:</strong> The strcat is an inbuilt function of the string class, which adds two character strings to return a concatenated string.</p> <p> <strong>Syntax</strong> </p> <pre> strcat ( char *arr1, char *arr2) </pre> <p>There are two character arrays in the above syntax, arr1 and arr2, which passed inside the strcat() function to return a concatenated string.</p> <p>Let&apos;s consider an example to combine two strings using strcat() function in the C++ programming.</p> <p> <strong>Program4.cpp</strong> </p> <pre> #include #include using namespace std; int main() { // declare and initialize the string char str1[] = &apos; We love&apos;; char str2[] = &apos; C++ Programming&apos;; cout &lt;&lt; &apos; String 1: &apos; &lt;<str1 <<endl; cout << \' string 2: <<str2 use the strcat() function to concatenate strcat(str1, str2); concatenated is: <<str1; return 0; } < pre> <p> <strong>Output</strong> </p> <pre> String 1: We love String 2: C++ Programming The concatenated string is: We love C++ Programming </pre> <h3>Program to concatenate two strings using the append function</h3> <p> <strong>append() function:</strong> An <strong>append()</strong> function is a predefined library function used to insert or add a second string at the end of the first string to return a single string.</p> <p> <strong>Syntax</strong> </p> <pre> str1.append(str2); </pre> <p>In the above syntax, the str2 is a second string to pass in the append() function that inserts the str2 string at the end of the str1 string.</p> <p>Let&apos;s consider an example to combine two strings using append() function in the C++ programming.</p> <p> <strong>Program5.cpp</strong> </p> <pre> #include using namespace std; int main () { string str1, str2, result; // declare string variables cout &lt;&gt; str1; // take string cout &lt;&gt; str2; // take second string // use append() function to insert element at the end of the str1 str1.append(str2); cout &lt;&lt; &apos; 
 The concatenation of the string is: &apos;&lt;&lt; str1; return 0; } </pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Hello Enter the second string: Friends! The concatenation of the string is: HelloFriends! </pre> <h3>Program to concatenate two string using the inheritance of the class</h3> <p>Let&apos;s consider an example to combine two strings using inheritance in the C++ programming.</p> <p> <strong>Program6.cpp</strong> </p> <pre> #include #include using namespace std; // create base class class base { protected: virtual string concatenate(string &amp;str1, string &amp;str2) = 0; }; // create derive class to acquire features of base class class derive: protected base { public: string concatenate (string &amp;str1, string &amp;str2) { string temp; temp = str1 + str2; return temp; } }; int main() { // declare variable string str1, str2; cout &lt;&gt;str1; cout &lt;&gt;str2; // create string object derive obj; // print string cout &lt;<\' 
 the concatenated string is: \' << obj.concatenate (str1, str2); return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter first string: C++ Enter second string: Programming The concatenated string is: C++Programming </pre> <h3>Program to concatenate two strings using the friend function and strcat() function</h3> <p>Let&apos;s consider an example to combine two strings using friend function and strcat() function in the C++ programming.</p> <p> <strong>Program7.cpp</strong> </p> <pre> #include #include using namespace std; class Base { private: char st[100], st2[100]; public: void inp() { cout &lt;<\' 100 enter the first string: \'; cin.getline (st, 100); take a line of string with limit cout <<\' second (st2, friend void myfun(base b); }; myfun (base b) { strcat (b.st, b.st2); pass parameter to concatenate concatenated \' < <b.st; } int main() base b; create b as an object b.inp(); call inp() function myfun(b); myfun() print return 0; pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: javatpoint Enter the second string: .com The concatenated string: javatpoint.com </pre> <hr></\'></pre></\'></pre></str1></pre></\'></pre></endl;>

C++ で + 演算子を使用して 2 つの文字列を連結するプログラム

+ オペレーター: これは、単純に 2 つの文字列を加算して、新しい連結された文字列を返す算術 '+' 演算子です。

単純なJavaプログラム

C++ プログラミングで + 演算子を使用して 2 つの文字列を結合する例を考えてみましょう。

Javaマップの例

プログラム3.cpp 

 #include using namespace std; int main () { string str1, str2; // declare string variables cout &lt;&gt; str1; cout &lt;&gt; str2; // use &apos;+&apos; operator to concatenate the str1 and str2 string result = str1 + str2; cout &lt;&lt; &apos; The concatenated string &apos; &lt;&lt; str1 &lt;&lt; &apos; and &apos; &lt;&lt; str2 &lt;<\' is: \' << result; return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Java Enter the second string: Tpoint The concatenated string Java and Tpoint is: JavaTpoint </pre> <h3>Program to concatenate two strings using the strcat() method</h3> <p> <strong>strcat() function:</strong> The strcat is an inbuilt function of the string class, which adds two character strings to return a concatenated string.</p> <p> <strong>Syntax</strong> </p> <pre> strcat ( char *arr1, char *arr2) </pre> <p>There are two character arrays in the above syntax, arr1 and arr2, which passed inside the strcat() function to return a concatenated string.</p> <p>Let&apos;s consider an example to combine two strings using strcat() function in the C++ programming.</p> <p> <strong>Program4.cpp</strong> </p> <pre> #include #include using namespace std; int main() { // declare and initialize the string char str1[] = &apos; We love&apos;; char str2[] = &apos; C++ Programming&apos;; cout &lt;&lt; &apos; String 1: &apos; &lt;<str1 <<endl; cout << \' string 2: <<str2 use the strcat() function to concatenate strcat(str1, str2); concatenated is: <<str1; return 0; } < pre> <p> <strong>Output</strong> </p> <pre> String 1: We love String 2: C++ Programming The concatenated string is: We love C++ Programming </pre> <h3>Program to concatenate two strings using the append function</h3> <p> <strong>append() function:</strong> An <strong>append()</strong> function is a predefined library function used to insert or add a second string at the end of the first string to return a single string.</p> <p> <strong>Syntax</strong> </p> <pre> str1.append(str2); </pre> <p>In the above syntax, the str2 is a second string to pass in the append() function that inserts the str2 string at the end of the str1 string.</p> <p>Let&apos;s consider an example to combine two strings using append() function in the C++ programming.</p> <p> <strong>Program5.cpp</strong> </p> <pre> #include using namespace std; int main () { string str1, str2, result; // declare string variables cout &lt;&gt; str1; // take string cout &lt;&gt; str2; // take second string // use append() function to insert element at the end of the str1 str1.append(str2); cout &lt;&lt; &apos; 
 The concatenation of the string is: &apos;&lt;&lt; str1; return 0; } </pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Hello Enter the second string: Friends! The concatenation of the string is: HelloFriends! </pre> <h3>Program to concatenate two string using the inheritance of the class</h3> <p>Let&apos;s consider an example to combine two strings using inheritance in the C++ programming.</p> <p> <strong>Program6.cpp</strong> </p> <pre> #include #include using namespace std; // create base class class base { protected: virtual string concatenate(string &amp;str1, string &amp;str2) = 0; }; // create derive class to acquire features of base class class derive: protected base { public: string concatenate (string &amp;str1, string &amp;str2) { string temp; temp = str1 + str2; return temp; } }; int main() { // declare variable string str1, str2; cout &lt;&gt;str1; cout &lt;&gt;str2; // create string object derive obj; // print string cout &lt;<\' 
 the concatenated string is: \' << obj.concatenate (str1, str2); return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter first string: C++ Enter second string: Programming The concatenated string is: C++Programming </pre> <h3>Program to concatenate two strings using the friend function and strcat() function</h3> <p>Let&apos;s consider an example to combine two strings using friend function and strcat() function in the C++ programming.</p> <p> <strong>Program7.cpp</strong> </p> <pre> #include #include using namespace std; class Base { private: char st[100], st2[100]; public: void inp() { cout &lt;<\' 100 enter the first string: \'; cin.getline (st, 100); take a line of string with limit cout <<\' second (st2, friend void myfun(base b); }; myfun (base b) { strcat (b.st, b.st2); pass parameter to concatenate concatenated \' < <b.st; } int main() base b; create b as an object b.inp(); call inp() function myfun(b); myfun() print return 0; pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: javatpoint Enter the second string: .com The concatenated string: javatpoint.com </pre> <hr></\'></pre></\'></pre></str1></pre></\'>

strcat() メソッドを使用して 2 つの文字列を連結するプログラム

strcat() 関数: strcat は string クラスの組み込み関数であり、2 つの文字列を追加して連結された文字列を返します。

構文 

 strcat ( char *arr1, char *arr2)

上記の構文には 2 つの文字配列、arr1 と arr2 があり、これらは strcat() 関数内で渡され、連結された文字列を返します。

C++ プログラミングで strcat() 関数を使用して 2 つの文字列を結合する例を考えてみましょう。

プログラム4.cpp 

 #include #include using namespace std; int main() { // declare and initialize the string char str1[] = &apos; We love&apos;; char str2[] = &apos; C++ Programming&apos;; cout &lt;&lt; &apos; String 1: &apos; &lt;<str1 <<endl; cout << \' string 2: <<str2 use the strcat() function to concatenate strcat(str1, str2); concatenated is: <<str1; return 0; } < pre> <p> <strong>Output</strong> </p> <pre> String 1: We love String 2: C++ Programming The concatenated string is: We love C++ Programming </pre> <h3>Program to concatenate two strings using the append function</h3> <p> <strong>append() function:</strong> An <strong>append()</strong> function is a predefined library function used to insert or add a second string at the end of the first string to return a single string.</p> <p> <strong>Syntax</strong> </p> <pre> str1.append(str2); </pre> <p>In the above syntax, the str2 is a second string to pass in the append() function that inserts the str2 string at the end of the str1 string.</p> <p>Let&apos;s consider an example to combine two strings using append() function in the C++ programming.</p> <p> <strong>Program5.cpp</strong> </p> <pre> #include using namespace std; int main () { string str1, str2, result; // declare string variables cout &lt;&gt; str1; // take string cout &lt;&gt; str2; // take second string // use append() function to insert element at the end of the str1 str1.append(str2); cout &lt;&lt; &apos; 
 The concatenation of the string is: &apos;&lt;&lt; str1; return 0; } </pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: Hello Enter the second string: Friends! The concatenation of the string is: HelloFriends! </pre> <h3>Program to concatenate two string using the inheritance of the class</h3> <p>Let&apos;s consider an example to combine two strings using inheritance in the C++ programming.</p> <p> <strong>Program6.cpp</strong> </p> <pre> #include #include using namespace std; // create base class class base { protected: virtual string concatenate(string &amp;str1, string &amp;str2) = 0; }; // create derive class to acquire features of base class class derive: protected base { public: string concatenate (string &amp;str1, string &amp;str2) { string temp; temp = str1 + str2; return temp; } }; int main() { // declare variable string str1, str2; cout &lt;&gt;str1; cout &lt;&gt;str2; // create string object derive obj; // print string cout &lt;<\' 
 the concatenated string is: \' << obj.concatenate (str1, str2); return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter first string: C++ Enter second string: Programming The concatenated string is: C++Programming </pre> <h3>Program to concatenate two strings using the friend function and strcat() function</h3> <p>Let&apos;s consider an example to combine two strings using friend function and strcat() function in the C++ programming.</p> <p> <strong>Program7.cpp</strong> </p> <pre> #include #include using namespace std; class Base { private: char st[100], st2[100]; public: void inp() { cout &lt;<\' 100 enter the first string: \'; cin.getline (st, 100); take a line of string with limit cout <<\' second (st2, friend void myfun(base b); }; myfun (base b) { strcat (b.st, b.st2); pass parameter to concatenate concatenated \' < <b.st; } int main() base b; create b as an object b.inp(); call inp() function myfun(b); myfun() print return 0; pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: javatpoint Enter the second string: .com The concatenated string: javatpoint.com </pre> <hr></\'></pre></\'></pre></str1>

append関数を使用して2つの文字列を連結するプログラム

append() 関数: アン 追加() function は、最初の文字列の末尾に 2 番目の文字列を挿入または追加して 1 つの文字列を返すために使用される事前定義されたライブラリ関数です。

構文 

 str1.append(str2);

上記の構文では、str2 は、str1 文字列の末尾に str2 文字列を挿入する append() 関数に渡す 2 番目の文字列です。

C++ プログラミングで append() 関数を使用して 2 つの文字列を結合する例を考えてみましょう。

プログラム5.cpp

文字を int Java に変換 
 #include using namespace std; int main () { string str1, str2, result; // declare string variables cout &lt;&gt; str1; // take string cout &lt;&gt; str2; // take second string // use append() function to insert element at the end of the str1 str1.append(str2); cout &lt;&lt; &apos; 
 The concatenation of the string is: &apos;&lt;&lt; str1; return 0; }

出力 

 Enter the first string: Hello Enter the second string: Friends! The concatenation of the string is: HelloFriends!

クラスの継承を利用して2つの文字列を連結するプログラム

C++ プログラミングで継承を使用して 2 つの文字列を結合する例を考えてみましょう。

プログラム6.cpp 

 #include #include using namespace std; // create base class class base { protected: virtual string concatenate(string &amp;str1, string &amp;str2) = 0; }; // create derive class to acquire features of base class class derive: protected base { public: string concatenate (string &amp;str1, string &amp;str2) { string temp; temp = str1 + str2; return temp; } }; int main() { // declare variable string str1, str2; cout &lt;&gt;str1; cout &lt;&gt;str2; // create string object derive obj; // print string cout &lt;<\' 
 the concatenated string is: \' << obj.concatenate (str1, str2); return 0; } < pre> <p> <strong>Output</strong> </p> <pre> Enter first string: C++ Enter second string: Programming The concatenated string is: C++Programming </pre> <h3>Program to concatenate two strings using the friend function and strcat() function</h3> <p>Let&apos;s consider an example to combine two strings using friend function and strcat() function in the C++ programming.</p> <p> <strong>Program7.cpp</strong> </p> <pre> #include #include using namespace std; class Base { private: char st[100], st2[100]; public: void inp() { cout &lt;<\' 100 enter the first string: \'; cin.getline (st, 100); take a line of string with limit cout <<\' second (st2, friend void myfun(base b); }; myfun (base b) { strcat (b.st, b.st2); pass parameter to concatenate concatenated \' < <b.st; } int main() base b; create b as an object b.inp(); call inp() function myfun(b); myfun() print return 0; pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: javatpoint Enter the second string: .com The concatenated string: javatpoint.com </pre> <hr></\'></pre></\'>

friends関数とstrcat()関数を使って2つの文字列を連結するプログラム

C++ プログラミングで、friend 関数と strcat() 関数を使用して 2 つの文字列を結合する例を考えてみましょう。

プログラム7.cpp 

 #include #include using namespace std; class Base { private: char st[100], st2[100]; public: void inp() { cout &lt;<\\' 100 enter the first string: \\'; cin.getline (st, 100); take a line of string with limit cout <<\\' second (st2, friend void myfun(base b); }; myfun (base b) { strcat (b.st, b.st2); pass parameter to concatenate concatenated \\' < <b.st; } int main() base b; create b as an object b.inp(); call inp() function myfun(b); myfun() print return 0; pre> <p> <strong>Output</strong> </p> <pre> Enter the first string: javatpoint Enter the second string: .com The concatenated string: javatpoint.com </pre> <hr></\\'>