输入两个整数，然后让用户选择1或者2，选1是调用max函数，输出二

#include<stdio.h>

int main ()
{
	int max(int,int);
	int min(int x,int y);
	int (*p)(int,int);
	int a;
	int b;
	int c;
	int n;
	printf("enter a and b:");
	scanf("%d,%d",&a,&b);
	printf("choose 1 or 2:");
	scanf("%d",&n);
	if(n == 1)
	{
		p = max;
	}
	else if(n == 2)
	{
		p = min;
	}
	c = (*p)(a,b);
	printf("a = %d,b = %dn",a,b);
	if(n == 1)
	{
		printf("max = %dn",c);
	}
	else
	{
		printf("min = %dn",c);
	}
	return 0;
}

int max(int x,int y)
{
	int z;
	if(x > y)
	{
		z = x;
	}
	else
	{
		z = y;
	}
	return z;
}

int min(int x,int y)
{
	int z;
	if(x < y)
	{
		z = x;
	}
	else
	{
		z = y;
	}
	return z;
}