在C / C ++中将字符串转换为数字

在本教程中，我们将讨论一个程序，以了解如何在C/C++中将字符串转换为数字。

C/C++提供了两种将字符串转换为数字的方法。

示例

使用sscanf()

#include<stdio.h> int main(){ const char *str = "12345"; int x; sscanf(str, "%d", &x); printf("\nThe value of x : %d", x); return 0; }

输出结果

The value of x : 12345

使用stoi()

#include <iostream> #include <string> using namespace std; int main(){ string str1 = "45"; string str2 = "3.14159"; string str3 = "31337 geek"; int myint1 = stoi(str1); int myint2 = stoi(str2); int myint3 = stoi(str3); cout << "stoi(\"" << str1 << "\") is " << myint1 << \n; cout << "stoi(\"" << str2 << "\") is "<< myint2 << \n; cout << "stoi(\"" << str3 << "\") is "<< myint3 << \n; return 0; }

输出结果

stoi("45") is 45 stoi("3.14159") is 3 stoi("31337 geek") is 31337