编辑代码

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
int x,y,z;
srand(time(0));
x=rand()%20;
y=rand()%20;
if(x<y){
z=y,y=x,x=z;
}
printf("%d-%d=%d",x,y,x-y);
return 0;
}