/*  Calculate.c  (c) Kari Laitinen

    http://www.naturalprogramming.com/

    2013-11-27 File created.
    2013-11-27 Last modification.
*/

#include  <stdio.h>

void  print_calculations ( int first_integer,
                           int second_integer )
{
   printf( "\n    %d + %d = %d", first_integer, second_integer,
           first_integer + second_integer ) ; 
   printf( "\n    %d - %d = %d", first_integer, second_integer,
           first_integer - second_integer ) ; 
   printf( "\n    %d * %d = %d", first_integer, second_integer,
           first_integer * second_integer ) ; 

   if ( second_integer  !=  0 )
   {
      printf( "\n    %d / %d = %d", first_integer, second_integer,
              first_integer / second_integer ) ; 
      printf( "\n    %d %% %d = %d\n", first_integer, second_integer,
              first_integer % second_integer ) ; 
   }
   else
   {
      printf( "\n    Cannot divide with zero. \n" ) ;
   }
}

int main( int    number_of_command_line_arguments,
          char*  command_line_arguments[] )
{
   int  first_operand, second_operand ;

   if ( number_of_command_line_arguments  ==  3 )
   {
      first_operand   =  atoi( command_line_arguments[ 1 ] ) ;
      second_operand  =  atoi( command_line_arguments[ 2 ] ) ;

      print_calculations( first_operand, second_operand ) ;
   }
   else
   {
      printf( "\n This program can perform basic calculations."
              "\n Give two integers separated by a space:  " ) ;

      scanf( "%d %d", &first_operand, &second_operand ) ;

      print_calculations( first_operand, second_operand ) ;
   }
}