Calculator in C

By: Emiley J

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 

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");
  }
}

Most Viewed Articles (in C )

perror() Function - example program in C

goto and labels in C

getch and ungetch in C

Fopen and Getc implementation program in C

Calculator in C

Pointers vs. Multi-dimensional Arrays in C

Using memset(), memcpy(), and memmove() in C

UNIX read and write system calls sample program in C

Character Counting sample program in C

Variable Scope and functions in C

assert() Function Example program in C