Calculator in C

By: Emiley J in C Tutorials on 2010-04-16

This is a simple calculator written in C. To use this calculator, just type the number, followed by the operand and then by another number. The application will then display the result. After the result is displayed, the program goes into the loop which asks if they want to do another calculation. If y is pressed, another calculation can be carried out.

#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");
  }
}

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