用C语言编写简易计算器

#include<stdio.h>
int main()
{
double number1=0.0;
double number2=0.0;
char operation=0;
for(;;)
{

printf("\nEnter the calculation\n");
scanf("%lf%c%lf",&number1,&operation,&number2);

switch(operation)
{
case '+':
printf("=%lf\n",number1+number2);
break;

case '-':
printf("=%lf\n",number1-number2);
break;

case '*':
printf("=%lf\n",number1*number2);
break;

case '/':
if(number2==0)
printf("\n\n\aDivision by zero error!\n");
else
printf("=%lf\n",number1/number2);
break;

case '%':
if((long)number2==0)
printf("\n\n\aDivision by zero error!\n");
else
printf("=%ld\n",(long)number1%(long)number2);
break;

default:
printf("\n\n\aDivision by zero error!\n");
break;
}
}
return 0;
}