9.5 函数指针

#include<iostream>
#include<stdlib.h>//qsort 
#define NUM 5
using namespace std;
int Compare(const void * a, const void * b)
{
	unsigned int * p1, *p2;//unsigned int 无符号类型，正整数 
	p1 = (unsigned int *)a;//强制类型转换 
	p2 = (unsigned int *)b;
	return (*p1%10 - *p2%10);//比较个位数的大小 
} 
int main()
{
	unsigned int a[NUM]={8,123,11,10,4};
	qsort(a,NUM,sizeof(unsigned int),Compare);
	for(int i = 0; i < NUM; ++i)
	{
		cout << a[i] << " ";
	}
	return 0;
}