做题的时候经常会使用到数据类型的最大最小值（如int, long, long long, char等），我也查了很多次，这次就记下来当笔记吧。
参考了C++ prime plus、各个博客、教程和c++官网，对C/C++中各个类型int、long、double、char、long long等基本类型的取值范围即最大最小值总结如下：
1字节 = 8位，“位”是计算机内存的基本单元
注意： 不同的操作系统和编译器会导致变量的取值范围不同，各位可以使用以下代码查看自己操作系统的变量取值范围：
#include<iostream> #include<string> #include <limits> using namespace std; int main(){ cout << "[type] \t\t" << "[所占字节数]\t[最大值]\t\t[最小值]"<< endl; cout << "bool: \t\t" << sizeof(bool) << "\t\t" << (numeric_limits<bool>::max)() << "\t\t\t" << (numeric_limits<bool>::min)() << endl; cout << "char: \t\t" << sizeof(char) << "\t\t" << CHAR_MAX << "\t\t\t" << CHAR_MIN << endl; cout << "signed char: \t" << sizeof(signed char) << "\t\t" << SCHAR_MAX << "\t\t\t" << SCHAR_MIN << endl; cout << "unsigned char: \t" << sizeof(unsigned char) << "\t\t" << UCHAR_MAX << "\t\t\t" << (numeric_limits<unsigned char>::min)() << endl; cout << "wchar_t: \t" << sizeof(wchar_t) << "\t\t" << (numeric_limits<wchar_t>::max)() << "\t\t\t" << (numeric_limits<wchar_t>::min)() << endl; cout << "short: \t\t" << sizeof(short) << "\t\t" << SHRT_MAX << "\t\t\t" << SHRT_MIN << endl; cout << "int: \t\t" << sizeof(int) << "\t\t" << INT_MAX << "\t\t" << INT_MIN << endl; cout << "unsigned: \t" << sizeof(unsigned) << "\t\t" << UINT_MAX << "\t\t" << (numeric_limits<unsigned>::min)() << endl; cout << "long: \t\t" << sizeof(long) << "\t\t" << LONG_MAX << "\t\t" << LONG_MIN << endl; cout << "unsigned long: \t" << sizeof(unsigned long) << "\t\t" << ULONG_MAX << "\t\t" << (numeric_limits<unsigned long>::min)() << endl; cout << "long long: \t" << sizeof(long long) << "\t\t" << LLONG_MAX << "\t" << LLONG_MIN << endl; cout << "double: \t" << sizeof(double) << "\t\t" << (numeric_limits<double>::max)() << "\t\t" << (numeric_limits<double>::min)() << endl;cout << "long double: \t" << sizeof(long double) << "\t\t" << (numeric_limits<long double>::max)() << "\t\t" << (numeric_limits<long double>::min)() << endl; cout << "float: \t\t" << sizeof(float) << "\t\t" << (numeric_limits<float>::max)() << "\t\t" << (numeric_limits<float>::min)() << endl; cout << "size_t: \t" << sizeof(size_t) << "\t\t" << (numeric_limits<size_t>::max)() << "\t\t" << (numeric_limits<size_t>::min)() << endl; cout << "string: \t" << sizeof(string) << endl; cout << "[type] \t\t" << "[所占字节数]\t[最大值]\t\t[最小值]"<< endl; return 0; }
该代码是我查看了其他文章和教程的代码后写的，我个人认为那些代码有些乱且有错，同时我也加上了他们都漏掉的long long数据类型的取值范围。
接下来是C++官网的宏定义数据表，作为参考：
头文件：#include <climits>或#include <limits.h>
教程中的表：
