#include <stdio.h>

int main() {
	float aux = 0, num;
	char op;

	printf("Calculadora:\n");
	for (;;) {
		printf("= %f\n", aux);
		if (scanf("%f%*c", &num) == 1) aux = num;
		else {
			scanf("%c%f%*c", &op, &num);
			if (op == '+') aux += num;
			else if (op == '-') aux -= num;
			else if (op == '*') aux *= num;
			else if (op == '/') aux /= num;
		}
	}
}