i++和++i 的区别

1.　　i++为后自增  整体表达式的值为自增之前的值

2.　　++i为前自增 整体表达式的值为自增后的值

 

# include <stdio.h>

int main(void)
{
    int a,b,c,d;
    a = b = 3;
    c = a++;
    d = ++b;
    printf("a = %d b = %d c = %d d = %d\n",a,b,c,d);
    return 0;

}

输出结果为　　 a = 4 b = 4 c = 3  d= 4