/*

Name:
Copyright: Deitel C How to Program
Author: StackOverflow1453
Date: 7/5/2013 11:43:43 AM
Description: Using Function Pointers to Create a Menu-Driven System

OUTPUT:

Enter a number between 0 and 2, 3 to end: 0
You entered 0 so function1 was called

Enter a number between 0 and 2, 3 to end: 1
You entered 1 so function2 was called

Enter a number between 0 and 2, 3 to end: 2
You entered 2 so function3 was called

Enter a number between 0 and 2, 3 to end: 3
Program execution completed.

*/
#include <stdio.h>
void function1(int m);
void function2(int n);
void function3(int k);
void function4(int p);

int main(void){

    int choice;

    /*
    *fPtr is an array of 4 pointers to function which takes an integer as a parameter
    *and does not return anything
    */
    void (*fPtr[4])(int z)={function1, function2, function3, function4};

    printf("0- Function1\n");
    printf("1- Function2\n");
    printf("2- Function3\n");

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

    while (choice!=20)
    {
        /*
        * choice is passed to function as array subscript and also the parameter passed to function via function pointer fPtr.
        */
        fPtr[choice](choice);
        printf("Enter a number between 0 and 2, 3 to end:");
        scanf("%d",&choice);

    }
    getch();
}
//prints sthg
void function1(int m){

    printf("You entered %d so function1 called.\n", m);

}
//prints sthg
void function2(int n){

    printf("You entered %d so function2 called.\n", n);

}
//prints sthg
void function3(int k){

    printf("You entered %d so function3 called.\n", k);

}

//function 4 exits program
void function4(int p){

    printf("You entered 3 so program terminated.\n");

}