程序代码：

#include <stdio.h>
#include <stdlib.h>

typedef void (*types)(void);
void counter(int a, types vd[3]);
void printx(void);
void printy(void);
void printj(void);

int main(void)
{
        types pp[3]={printx,printy,printj};
        int x;
        printf("请选择一个打印功能\n");
        printf("0--printX\n");
        printf("1--printY\n");
        printf("2--printJ\n");
        scanf("%d",&x);
        counter(x,pp);
        system("pause");
        return 0;
}
void counter(int a, types vd[3])
{
        vd[a]();
}

void printx(void)
{
        printf("XXXXXXXXXXXXXXXXXXXX\n");
}
void printy(void)
{
        printf("YYYYYYYYYYYYYYYYYYYY\n");
}
void printj(void)
{
        printf("JJJJJJJJJJJJJJJJJJJJ\n");
}

程序代码：

#include <stdio.h>
#include <stdlib.h>

typedef void (*types)(void);
void counter(int a, types* vd);
void printx(void);
void printy(void);
void printj(void);
//扩展打印功能 3-printk
void printk(void);
void guid(char* str[],int menu_count);

types pp[]={printx,printy,printj,printk};
char* str[]={
                {"请选择一个打印功能\n"},
                {"0--printX\n"},
                {"1--printY\n"},
                {"2--printJ\n"},
                {"3--printK\n"}
            };

int main(void)
{

        int x;
        guid(str,4);
        scanf("%d",&x);
        counter(x,pp);
        system("pause");
        return 0;
}
void counter(int a, types* vd)
{
        vd[a]();
}

void printx(void)
{
        printf("XXXXXXXXXXXXXXXXXXXX\n");
}
void printy(void)
{
        printf("YYYYYYYYYYYYYYYYYYYY\n");
}
void printj(void)
{
        printf("JJJJJJJJJJJJJJJJJJJJ\n");
}

//扩展打印功能 3-printk
void printk(void)
{
        printf("KKKKKKKKKKKKKKKKKKKK\n");
}

void guid(char* str[],int menu_count)
{
        while((menu_count--)>=0) printf(*str++);
}