C语言编程-计算器，四则运算

#include
#include
int calc(int num1, char sbool, int num2);     //形式参数
//计算器，四则运算
int main()
{
	int num1, num2;
	char sbool;
	scanf("%d %c %d", &num1, &sbool, &num2);//通过键盘输入
	int ret = calc(num1, sbool, num2);           //调用函数
	printf("%d %c %d = %d", num1, sbool, num2, ret);   //功能：能将我们输入进去的数完整的打印，例如：5+4=9
	return 0;
}
int calc(int num1, char sbool, int num2)
{
	int ret;
	switch (sbool)
	{
	case '+':
		ret = num1 + num2;
		break;
	case '-':
		ret = num1 - num2;
		break;
	case '*':
		ret = num1 * num2;
		break;
	default:
		ret = num1 / num2;
		break;
	}
	return ret;
}