strcmp的返回值 字符串比較

strcmp的返回值

linux下的vim下；

返回值爲前面的字符串的減去後面字符串的值；

vs2019下：

#include<iostream>
using namespace std;

int main()
{
    char ch[] = "asdasd";
    char ch2[] = "asdasd";
    char ch3[]= "asdas2";
    char ch4[] = "asdasd123";
    int num = strcmp(ch, ch2);
    int num2 = strcmp(ch, ch3);
    int num3= strcmp(ch, ch4);

    cout << num << endl;
    cout << num2 << endl;
    cout << num3 << endl;
}

等於返回0；第一個大於第二個返回1，小於返回-1；