#include <stdio.h>
 
int main(void)
{
	int a, b;
 
	printf("整数aとbの値：\n");	scanf("%d%d", &a, &b);
	printf("a + b = %d\n", a + b);
	printf("a - b = %d\n", a - b);
	printf("a * b = %d\n", a * b);
	printf("a / b = %d\n", a / b);
	printf("a %% b = %d\n", a % b);
	printf("(a+b)/2 = %d\n", (a + b) / 2);
	printf("平均値 = %d\n/n", (double)(a + b) / 2);
 
	double r;
 
	printf("半径：\n");	scanf("%lf", &r);
	printf("半径%.3fの円の面積は%.3dです。\n", r, 3.14 * r * r);
 
	return 0;
}
 

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