C++ 字符串

在 C++ 中，字符串是一个代表字符序列的 std::string 类的对象。我们可以对字符串执行许多操作，例如拼接、比较、转换等等。

C++ 字符串示例

让我们看一下 C++ 字符串的简单示例。

#include <iostream>
using namespace std;
int main( ) {
    string s1 = "Hello";  
        char ch[] = { 'C', '+', '+'};  
        string s2 = string(ch);  
        cout<<s1<<endl;  
        cout<<s2<<endl;  
}

输出：

Hello
C++

C++字符串比较示例

让我们看一下使用strcmp()函数进行字符串比较的简单示例。

#include 
#include <cstring>
using namespace std;
int main ()
{
  char key[] = "mango";
  char buffer[50];
  do {
     cout<<"What is my favourite fruit? ";
     cin>>buffer;
  } while (strcmp (key,buffer) != 0);
 cout<<"Answer is correct!!"<<endl;
  return 0;
}

输出：

What is my favourite fruit? apple
What is my favourite fruit? banana
What is my favourite fruit? mango
Answer is correct!!

C++字符串连接示例

使用strcat()函数的简单示例。

#include <iostream>
#include <cstring>
using namespace std;
int main()
{
    char key[25], buffer[25];
    cout << "Enter the key string: ";
    cin.getline(key, 25);
    cout << "Enter the buffer string: ";
     cin.getline(buffer, 25);
    strcat(key, buffer); 
    cout << "Key = " << key << endl;
    cout << "Buffer = " << buffer<<endl;
    return 0;
}

输出：

Enter the key string: Welcome to
Enter the buffer string:  C++ Programming.
Key = Welcome to C++ Programming.
Buffer =  C++ Programming.

C++字符串复制示例

让我们来看一个使用strcpy()函数复制字符串的简单示例。

#include <iostream>
#include <cstring>
using namespace std;
int main()
{
    char key[25], buffer[25];
    cout << "Enter the key string: ";
    cin.getline(key, 25);
    strcpy(buffer, key);
    cout << "Key = "<< key << endl;
    cout << "Buffer = "<< buffer<<endl;
    return 0;
}

输出：

Enter the key string: C++ Tutorial
Key = C++ Tutorial
Buffer = C++ Tutorial

C++字符串长度示例

让我们来看一个简单的示例，使用strlen()函数来找到字符串的长度。

#include <iostream>
#include <cstring>
using namespace std;
int main()
{
    char ary[] = "Welcome to C++ Programming";
    cout << "Length of String = " << strlen(ary)<<endl;
    return 0;
}

输出：

Length of String = 26

C++字符串函数