stdio.h就是指“standard input&output"
意思就是说标准输入输出头文件！
所以了，用到标准输入输出函数时，就要调用这个头文件

C/C++头文件

include <assert.h> //设定插入点include <ctype.h> //字符处理include <errno.h> //定义错误码include <float.h> //浮点数处理include <fstream.h> //文件输入／输出include <iomanip.h> //参数化输入／输出include <iostream.h> //数据流输入／输出include <limits.h> //定义各种数据类型最值常量include <locale.h> //定义本地化函数include <math.h> //定义数学函数include <stdio.h> //定义输入／输出函数include <stdlib.h> //定义杂项函数及内存分配函数#include <string.h> //字符串处理include <strstrea.h> //基于数组的输入／输出include <time.h> //定义关于时间的函数#include <wchar.h> //宽字符处理及输入／输出include <wctype.h> //宽字符分类//////////////////////////////////////////////////////////////////////////标准 C++ （同上的不再注释）include <algorithm> //STL 通用算法include <bitset> //STL 位集容器include <cctype>#include <cerrno>include <clocale>include <cmath>include <complex> //复数类#include <cstdio>#include <cstdlib>include <cstring>#include <ctime>include <deque> //STL 双端队列容器include <exception> //异常处理类include <fstream>include <functional> //STL 定义运算函数（代替运算符）include <limits>#include <list> //STL 线性列表容器#include <map> //STL 映射容器include <iomanip>#include <ios> //基本输入／输出支持#include <iosfwd> //输入／输出系统使用的前置声明include <iostream>include <istream> //基本输入流include <ostream> //基本输出流include <queue> //STL 队列容器include <set> //STL 集合容器#include <sstream> //基于字符串的流include <stack> //STL 堆栈容器include <stdexcept> //标准异常类include <streambuf> //底层输入／输出支持include <string> //字符串类include <utility> //STL 通用模板类include <vector> //STL 动态数组容器include <cwchar>include <cwctype>using namespace std;//////////////////////////////////////////////////////////////////////////C99 增加include <complex.h> //复数处理include <fenv.h> //浮点环境include <inttypes.h> //整数格式转换include <stdbool.h> //布尔环境include <stdint.h> //整型环境include <tgmath.h> //通用类型数学宏

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