前后缀操作符的区别

前缀：++m，先自增，后赋值

后缀：m++，先赋值，后自增

#include <stdio.h>
int main(void)
{
    int n,a, m = 1;
    n = ++ m;        //m先自增，再赋值给n
    printf(n，m);     //m = 2，n = 2
    a = m ++;        //m先赋值给a，再自增
    printf(a,m);      //a = 2,m = 3
    return 0;
}

 

int a,m = 1;
m = - a ++       //-优先级最高，a = -a,然后赋值 m = a，最后a自增：a = a + 1