C++ basic_string c_str用法及代码示例

basic_string::c_str()是C++中的内置函数，该函数返回一个指向数组的指针，该数组包含一个空终止的字符序列，这些序列表示basic_string对象的当前值。此数组包含组成basic_string对象值的相同字符序列，最后还有一个额外的终止null-character。

用法:

const CharT* c_str() const

参数：该函数不接受任何参数。

返回值：该函数返回一个以Null结尾的常量指针，该指针指向字符串的字符数组存储。

下面是上述函数的实现：

示例1:

// C++ code for illustration of 
// basic_string::c_str function 
#include <bits/stdc++.h> 
#include <string> 
using namespace std; 
  
int main() 
{ 
    // declare a example string 
    string s1 = "GeeksForGeeks"; 
  
    // check if the size of the string is same as the 
    // size of character pointer given by c_str 
    if (s1.size() == strlen(s1.c_str())) { 
        cout << "s1.size is equal to strlen(s1.c_str()) " << endl; 
    } 
    else { 
        cout << "s1.size is not equal to strlen(s1.c_str())" << endl; 
    } 
  
    // print the string 
    printf("%s \n", s1.c_str()); 
}

输出：

s1.size is equal to strlen(s1.c_str()) 
GeeksForGeeks

示例2:

// C++ code for illustration of 
// basic_string::c_str function 
#include <bits/stdc++.h> 
#include <string> 
using namespace std; 
  
int main() 
{ 
    // declare a example string 
    string s1 = "Aditya"; 
  
    // print the characters of the string 
    for (int i = 0; i < s1.length(); i++) { 
        cout << "The " << i + 1 << "th character of string " << s1 
             << " is " << s1.c_str()[i] << endl; 
    } 
}

输出：

The 1th character of string Aditya is A
The 2th character of string Aditya is d
The 3th character of string Aditya is i
The 4th character of string Aditya is t
The 5th character of string Aditya is y
The 6th character of string Aditya is a

相关用法

注：本文由纯净天空筛选整理自AdityaTiwari5大神的英文原创作品 basic_string c_str function in C++ STL。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。