函数体内,return语句的表达式的值必须是地址值这是c++返回指针的函数关键
比如求素数的例子
<span style="font-size:24px;">// test.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <IOSTREAM>
#include <MATH.H>
using namespace std;
int k;
int* prime(int*p, int m, int* q);
int main(int argc, char* argv[])
{
int a[10] = { 23, 12, 59, 48, 16, 31, 27, 19, 9, 87}, b[10];
int n = 10, *p = b;
for (int i = 0; i< n; ++i)
{
cout<<a[i]<<" ";
}
cout<<endl;
p = prime(a, 10, p);
for (i = 0; i < k; ++ i)
{
cout<<*p++<<" ";
}
printf("Hello Worl;d!\n");
return 0;
}
int* prime(int*p, int m, int* q)
{
int* w, i, j, flag, *q1 = q;
for (i = 0; i < m; ++i)
{
flag = 1;
w = p + i;
for ( j = 2; j <= sqrt(*(p+i)); ++j)
{
if (*w % j == 0)
{
flag = 0;
}
}
if (flag)
{
*q++ = *w;
k++;
}
}
return q1;
}
</span>