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A calculator that allows multiple calculations

#include <stdio.h> int main() {   double number1 = 1.0;   double number2 = 2.0;   char operation = '+';   char answer = 0;   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\aIllegal operation!\n");   } }