fig17_11.c

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

// Fig 17.11: fig17_11.c
// Using the boolean type and the values true and false in C99
#include <stdio.h>
#include <stdbool.h> // allows bool, true, and false

bool isEven( int number ); // function prototype

int main( void )
{ 
   int input; // value entered by user
   bool valueIsEven; // stores result of function isEven
   
   // loop for 2 inputs
   for ( int i = 0; i < 2; i++ ) { 
      printf( "Enter an integer: " );
      scanf( "%d", &input );
   
      valueIsEven = isEven( input ); // determine whether input is even

      // determine whether input is even
      if ( valueIsEven ) {
         printf( "%d is even\n\n", input );
      } // end if
      else {
         printf( "%d is odd\n\n", input );
      } // end else
   } // end for

   return 0;
} // end main

// even returns true if number is even 
bool isEven( int number )
{ 
   if ( number % 2 == 0 ) { // is number divisible by 2?
      return true;
   } 
   else {
      return false;
   }
} // end function isEven 


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