ptr2.c

里面包含很多c语言的源码

/* Using a pointer to call different functions. */

#include <stdio.h>

/* The function prototypes. */

void func1(int x);
void one(void);
void two(void);
void other(void);

int main( void )
{
    int nbr;

    for (;;)
    {
        puts("\nEnter an integer between 1 and 10, 0 to exit: ");
        scanf("%d", &nbr);

        if (nbr == 0)
            break;
        func1(nbr);
    }
    return 0;
}

void func1(int val)
{
    /* The pointer to function. */

    void (*ptr)(void);

    if (val == 1)
        ptr = one;
    else if (val == 2)
        ptr = two;
    else
        ptr = other;

    ptr();
}

void one(void)
{
    puts("You entered 1.");
}

void two(void)
{
    puts("You entered 2.");
}

void other(void)
{
    puts("You entered something other than 1 or 2.");
}