fig07_28.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. 7.28: fig07_28.c
   Demonstrating an array of pointers to functions */
#include <stdio.h>

/* prototypes */
void function1( int a );
void function2( int b );
void function3( int c );

int main( void )
{
   /* initialize array of 3 pointers to functions that each take an
      int argument and return void */
   void (*f[ 3 ])( int ) = { function1, function2, function3 };

   int choice; /* variable to hold user's choice */

   printf( "Enter a number between 0 and 2, 3 to end: " );
   scanf( "%d", &choice );

   /* process user's choice */
   while ( choice >= 0 && choice < 3 ) {

      /* invoke function at location choice in array f and pass
         choice as an argument */
      (*f[ choice ])( choice );

      printf( "Enter a number between 0 and 2, 3 to end: ");
      scanf( "%d", &choice );
   } /* end while */

   printf( "Program execution completed.\n" );

   return 0; /* indicates successful termination */

} /* end main */

void function1( int a )
{
   printf( "You entered %d so function1 was called\n\n", a );
} /* end function1 */

void function2( int b )
{
   printf( "You entered %d so function2 was called\n\n", b );
} /* end function2 */

void function3( int c )
{
   printf( "You entered %d so function3 was called\n\n", c );
} /* end function3 */



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