>>277 足し算で
#include <stdio.h>
int main(void)
{
int a,b,c;
scanf("%d %d",&a,&b);
if (a<b){c=a;a=b;b=c;}c=0;b=-(b);
while (b++)printf(b?"%d + ":"%d = %d\n",a,c+=a);
return 0;
}