函数指针

最新推荐文章于 2025-04-01 01:07:14 发布

tsinfeng

最新推荐文章于 2025-04-01 01:07:14 发布

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分类专栏： c/c++语言文章标签： integer input c

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函数指针 void (*f)()
函数返回指针 void* f()
const 指针 const int*
指向const的指针 int* const
指向const的const指针 const int* const

以下为函数指针的应用
#include "stdafx.h" #include<stdio.h> int max(int a,int b) { return a>b?a:b; } int _tmain(int argc, _TCHAR* argv[]) { int max(int,int); int (*p)(int,int)=&max; int a,b,c,d; printf("Please input three integer number:/n"); scanf("%d%d%d",&a,&b,&c); d=(*p)((*p)(a,b),c); printf("Among %d %d and %d, the maxmal integer is %d!/n",a,b,c,d); getchar(); return 0; }

传递动态内存

// FunctionPointExample.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include<iostream> using namespace std; void GetMemory(char **p,int num)//**p指向指针的指针 { *p=(char*)malloc(sizeof(char)*num); } char *GetMemory1(char *p,int num) { p=(char*)malloc(sizeof(char)*num); return p; } int _tmain(int argc, _TCHAR* argv[]) { char *str=NULL; GetMemory(&str,100);//&str指针的地址 strcpy(str,"Hello,world!"); cout<<*str<<endl; cout<<str<<endl; cout<<&str<<endl; free(str); GetMemory1(str,100); strcpy(str,"Good,everyone!"); cout<<*str<<endl; cout<<str<<endl; cout<<&str<<endl; getchar(); return 0; }