calculator

[volk]

Is it very complex to make a calculator program using C?

[volk]

Can you please explain how to make one then if it isn't so complex to do so?

[Prelude]

>Can you please explain how to make one then if it isn't so complex to do so?

#include <stdio.h>
#include <stdlib.h>

int main ( void )
{
  char op;
  int a, b, result = 0;

  printf ( "Enter an expression (ex. +5 4): " );

  if ( scanf ( "%c%d%d", &op, &a, &b ) != 3 ) {
    fprintf ( stderr, "Invalid input\n" );
    exit ( EXIT_FAILURE );
  }

  switch ( op ) {
  case '+': result = a + b; break;
  case '-': result = a - b; break;
  case '*': result = a * b; break;
  case '/':
    if ( b == 0 ) {
      fprintf ( stderr, "Integer divide by zero\n" );
      exit ( EXIT_FAILURE );
    }

    result = a / b;
  }

  printf ( "%d %c %d = %d\n", a, op, b, result );

  return 0;
}

-Prelude