C++零基础 | 超详细C++入门到入坟 | 〔3〕数据类型
作者:互联网
系列文章目录
文章目录
写在前面
本系列教程为C++初学者打造,大佬请直接无视。
一、基本数据类型
C++中有7种最基本的数据类型:
类型 | 含义 |
---|---|
int | 整型(整数) |
float | 单精度浮点数(~7) |
double | 双精度浮点数(~15) |
bool | 布尔(真或假) |
char | 字符 |
void | 无类型 |
wchar_t1 | 宽字符 |
基本类型可以用一些修饰符修饰:
- signed
- unsigned
- long
- short
阅读数据类型储存空间一览查看大多数电脑配置的储存空间。
您也可以运行以下程序获取:
#include<iostream>
#include <limits>
using namespace std;
int main()
{
cout << "type: \t\t" << "************size**************"<< endl;
cout << "bool: \t\t" << "所占字节数:" << sizeof(bool);
cout << "\t最大值:" << (numeric_limits<bool>::max)();
cout << "\t\t最小值:" << (numeric_limits<bool>::min)() << endl;
cout << "char: \t\t" << "所占字节数:" << sizeof(char);
cout << "\t最大值:" << (numeric_limits<char>::max)();
cout << "\t\t最小值:" << (numeric_limits<char>::min)() << endl;
cout << "signed char: \t" << "所占字节数:" << sizeof(signed char);
cout << "\t最大值:" << (numeric_limits<signed char>::max)();
cout << "\t\t最小值:" << (numeric_limits<signed char>::min)() << endl;
cout << "unsigned char: \t" << "所占字节数:" << sizeof(unsigned char);
cout << "\t最大值:" << (numeric_limits<unsigned char>::max)();
cout << "\t\t最小值:" << (numeric_limits<unsigned char>::min)() << endl;
cout << "wchar_t: \t" << "所占字节数:" << sizeof(wchar_t);
cout << "\t最大值:" << (numeric_limits<wchar_t>::max)();
cout << "\t\t最小值:" << (numeric_limits<wchar_t>::min)() << endl;
cout << "short: \t\t" << "所占字节数:" << sizeof(short);
cout << "\t最大值:" << (numeric_limits<short>::max)();
cout << "\t\t最小值:" << (numeric_limits<short>::min)() << endl;
cout << "int: \t\t" << "所占字节数:" << sizeof(int);
cout << "\t最大值:" << (numeric_limits<int>::max)();
cout << "\t最小值:" << (numeric_limits<int>::min)() << endl;
cout << "unsigned: \t" << "所占字节数:" << sizeof(unsigned);
cout << "\t最大值:" << (numeric_limits<unsigned>::max)();
cout << "\t最小值:" << (numeric_limits<unsigned>::min)() << endl;
cout << "long: \t\t" << "所占字节数:" << sizeof(long);
cout << "\t最大值:" << (numeric_limits<long>::max)();
cout << "\t最小值:" << (numeric_limits<long>::min)() << endl;
cout << "unsigned long: \t" << "所占字节数:" << sizeof(unsigned long);
cout << "\t最大值:" << (numeric_limits<unsigned long>::max)();
cout << "\t最小值:" << (numeric_limits<unsigned long>::min)() << endl;
cout << "double: \t" << "所占字节数:" << sizeof(double);
cout << "\t最大值:" << (numeric_limits<double>::max)();
cout << "\t最小值:" << (numeric_limits<double>::min)() << endl;
cout << "long double: \t" << "所占字节数:" << sizeof(long double);
cout << "\t最大值:" << (numeric_limits<long double>::max)();
cout << "\t最小值:" << (numeric_limits<long double>::min)() << endl;
cout << "float: \t\t" << "所占字节数:" << sizeof(float);
cout << "\t最大值:" << (numeric_limits<float>::max)();
cout << "\t最小值:" << (numeric_limits<float>::min)() << endl;
cout << "size_t: \t" << "所占字节数:" << sizeof(size_t);
cout << "\t最大值:" << (numeric_limits<size_t>::max)();
cout << "\t最小值:" << (numeric_limits<size_t>::min)() << endl;
cout << "string: \t" << "所占字节数:" << sizeof(string) << endl;
// << "\t最大值:" << (numeric_limits<string>::max)() << "\t最小值:" << (numeric_limits<string>::min)() << endl;
cout << "type: \t\t" << "************size**************"<< endl;
return 0;
}
二、typedef声明
您可以使用 typedef
为一个已有的类型取一个新的名字。下面是使用 typedef 定义一个新类型的语法:
typedef type newname;
如C++size_t
的定义
typedef unsigned int size_t;
size_t a=5;//合法
类似地,也可以使用#define
预处理器,如:
#define newt long long int
注意没有分号且写在前面的是新名字,后面会再详细介绍。
三、枚举类型
见枚举类型
wchar_t
宽字符的本质是short int
↩︎
标签:typedef,cout,min,int,max,数据类型,C++,到入 来源: https://blog.csdn.net/HaohaoCppDebuger/article/details/121499734