题解 | #简单计算器#

#include <stdio.h>

int main()

{

char flag;

double a, b;

scanf("%lf %c %lf", &a, &flag, &b);

if (flag != '+' && flag != '-' && flag != '*' && flag != '/')

printf("Invalid operation!\n");

else

{

switch (flag)

{

case '+':printf("%.4f+%.4f=%.4f\n", a, b, a + b);

break;

case '-':printf("%.4f-%.4f=%.4f\n", a, b, a - b);

break;

case '*':printf("%.4f*%.4f=%.4f\n", a, b, a * b);

break;

case '/':

{

if (b == 0)

printf("Wrong!Division by zero!\n");

else

printf("%.4f/%.4f=%.4f\n", a, b, a / b);

break;

}

}

}

return 0;

}