字符串函数以及宏定义

最小值、以及平方的宏定义实现，注意（）的使用

#include <stdio.h>
#include <string.h>

#define MIN(a,b) (a)<(b)?(a):(b)
#define SQRT(a) (a)*(a)

int main(int argc, char **argv) {
    printf("Hello, World!\n");
    
    int a = 10;
    int b = 20;
    
    int min = MIN(a,b);
    
    printf("min = %d\n",min);
    
    int sqrt = SQRT(a);
    printf("sqrt = %d\n",sqrt);
    
    char *c = "abc";
    printf("c = %s\n",c);
    
    char *d;
    memcpy(d,c,2);
    printf("d = %s\n",d);
    
    return 0;
    
}