题解 | #简单计算器#

#include <stdio.h>

int main() {
	double a = 0.0, b = 0.0;
	char c = 0;
	scanf("%lf%c%lf", &a, &c, &b);

	if (c != '+' && c != '-' && c != '*' && c != '/')
		printf("Invalid operation!");
	else
	{
		if (b == 0.0 && c == '/')
			printf("Wrong!Division by zero!");
		else 
		{
			switch (c) {
			case '+': printf("%.4f+%.4f=%.4f", a, b, a + b); break;
			case '-': printf("%.4f-%.4f=%.4f", a, b, a - b); break;
			case '*': printf("%.4f*%.4f=%.4f", a, b, a * b); break;
			case '/': printf("%.4f/%.4f=%.4f", a, b, a / b); break;
			}
		}
	}

	return 0;
}