>[info]宏#define命令练习。 ~~~C #include <stdio.h> #define TRUE 1 #define FALSE 0 #define SQ(x) (x)*(x) int main(){ int again=1,num; printf("如果值小于50就结束\n"); while(again) { printf("输入一个值:"); scanf("%d", &num); printf("该值的平方是：%d\n", SQ(num)); if(num>50) again=TRUE; else again=FALSE; } return 0; } ~~~