常见的数据范围
一、总结
| 名称 | 字节 | 位数（二进制） | 最小值 | 最大值 | 位数（十进制） |
| bool | 1 | 8 | 0 | 1 | 1 |
| char | 1 | 8 | |||
| shrot | 2 | 16 （-2^15 到2^15 -1） | -32768 | 32767 | 5 |
| int | 4 | 32 （-2^31 到 2^31 -1） | -2147483648 | 2147483647 | 10 |
| unsigned int | 4 | 32 | 0 | 4294967295 | 10 |
| long | 4 | 32 | -2147483648 | 2147483647 | 10 |
| long long | 8 | 64 | -9223372036854775808 | 9223372036854775807 | 19 |
| float | 4 | 32 | 1.17549e-038 | 3.40282e+038 | |
| double | 8 | 64 | 2.22507e-308 | 1.79769e+308 | |
| string | 8 | 64 |
二、测试代码
#include<iostream> #include<string> #include <limits> using namespace std; int main() { cout << "type:\t\t" << "---size---" << endl; cout << "bool:\t\t" << "所占字节数：" << sizeof(bool) << "\t位数：" << sizeof(bool)*8 << "\t\t最小值：" << (numeric_limits<bool>::min)() << "\t\t最大值：" << (numeric_limits<bool>::max)() << endl << endl; cout << "char:\t\t" << "所占字节数：" << sizeof(char) << "\t位数：" << sizeof(char) * 8 << "\t\t最小值：" << (numeric_limits<char>::min)() << "\t\t最大值：" << (numeric_limits<char>::max)() << endl << endl; cout << "signed char:\t" << "所占字节数：" << sizeof(signed char) << "\t位数：" << sizeof(signed char) * 8 << "\t\t最小值：" << (numeric_limits<signed char>::min)() << "\t\t最大值：" << (numeric_limits<signed char>::max)() << endl << endl; cout << "unsigned char: \t" << "所占字节数：" << sizeof(unsigned char) << "\t位数：" << sizeof(unsigned char) * 8 << "\t\t最小值：" << (numeric_limits<unsigned char>::min)() << "\t\t最大值：" << (numeric_limits<unsigned char>::max)() << endl << endl; cout << "wchar_t: \t" << "所占字节数：" << sizeof(wchar_t) << "\t位数：" << sizeof(wchar_t) * 8 << "\t最小值：" << (numeric_limits<wchar_t>::min)() << "\t\t最大值：" << (numeric_limits<wchar_t>::max)() << endl << endl; cout << "short: \t\t" << "所占字节数：" << sizeof(short) << "\t位数：" << sizeof(short) * 8 << "\t最小值：" << (numeric_limits<short>::min)() << "\t\t最大值：" << (numeric_limits<short>::max)() << endl << endl; cout << "int: \t\t" << "所占字节数：" << sizeof(int) << "\t位数：" << sizeof(int) * 8 << "\t最小值：" << (numeric_limits<int>::min)() << "\t最大值：" << (numeric_limits<int>::max)() << endl << endl; cout << "unsigned int: \t" << "所占字节数：" << sizeof(unsigned) << "\t位数：" << sizeof(unsigned) * 8 << "\t最小值：" << (numeric_limits<unsigned>::min)() << "\t\t最大值：" << (numeric_limits<unsigned>::max)() << endl << endl; cout << "long: \t\t" << "所占字节数：" << sizeof(long) << "\t位数：" << sizeof(long) * 8 << "\t最小值：" << (numeric_limits<long>::min)() << "\t最大值：" << (numeric_limits<long>::max)() << endl << endl; cout << "unsigned long: \t" << "所占字节数：" << sizeof(unsigned long) << "\t位数：" << sizeof(unsigned long) * 8 << "\t最小值：" << (numeric_limits<unsigned long>::min)() << "\t\t最大值：" << (numeric_limits<unsigned long>::max)() << endl << endl; cout << "float: \t\t" << "所占字节数：" << sizeof(float) << "\t位数：" << sizeof(float) * 8 << "\t最小值：" << (numeric_limits<float>::min)() << "\t最大值：" << (numeric_limits<float>::max)() << endl << endl; cout << "double: \t" << "所占字节数：" << sizeof(double) << "\t位数：" << sizeof(double) * 8 << "\t最小值：" << (numeric_limits<double>::min)() << "\t最大值：" << (numeric_limits<double>::max)() << endl << endl; cout << "size_t: \t" << "所占字节数：" << sizeof(size_t) << "\t位数：" << sizeof(size_t) * 8 << "\t最小值：" << (numeric_limits<size_t>::min)() << "\t\t最大值：" << (numeric_limits<size_t>::max)() << endl << endl; cout << "string: \t" << "所占字节数：" << sizeof(string) << "\t位数：" << sizeof(string) * 8 << endl; cout << "long long: \t" << "所占字节数：" << sizeof(long long) << "\t位数：" << sizeof(long long) * 8 << "\t最小值：" << (numeric_limits<long long>::min)() << "\t\t最大值：" << (numeric_limits<long long>::max)() << endl << endl; system("pause"); return 0; }(adsbygoogle = window.adsbygoogle || []).push({});