#include <stdio.h>
int main(void) {int a,b,c;printf("整数と演算を表す数字を入力:\n"); scanf("%d %d %d",&a,&b,&c);switch(c){case 1:printf("%d + %d = %d",a,b,a+b); break;case 2:printf("%d - %d = %d",a,b,a-b); break;case 3:printf("%d × %d = %d",a,b,a*b); break;case 4:if(b!=0 && a%b != 0){printf("%d ÷ %d = %d余り%d",a,b,a/b,a%b); break;}else if(b != 0 && a%b == 0){printf("%d ÷ %d = %d",a,b,a/b); break;}else{printf("error"); break;}default: printf("error");}return 0;}

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4
3
3