求各种数据类型所占用的字节数可调用sizeof函数,求各种数据类型的最大值可以调用limits标准库中的numeric_limits<T>::max(),numeric_limits<T>::min()函数
#include<iostream> #include<string> #include <limits> using namespace std; int main() { cout << "type: " << "************size**************" << endl; cout << "bool: " << "所占字节数:" << sizeof(bool); cout << " 最大值:" << (numeric_limits<bool>::max)(); cout << " 最小值:" << (numeric_limits<bool>::min)() << endl; cout << "char: " << "所占字节数:" << sizeof(char); cout << " 最大值:" << (numeric_limits<char>::max)(); cout << " 最小值:" << (numeric_limits<char>::min)() << endl; cout << "signed char: " << "所占字节数:" << sizeof(signed char); cout << " 最大值:" << (numeric_limits<signed char>::max)(); cout << " 最小值:" << (numeric_limits<signed char>::min)() << endl; cout << "unsigned char: " << "所占字节数:" << sizeof(unsigned char); cout << " 最大值:" << (numeric_limits<unsigned char>::max)(); cout << " 最小值:" << (numeric_limits<unsigned char>::min)() << endl; cout << "wchar_t: " << "所占字节数:" << sizeof(wchar_t); cout << " 最大值:" << (numeric_limits<wchar_t>::max)(); cout << " 最小值:" << (numeric_limits<wchar_t>::min)() << endl; cout << "short: " << "所占字节数:" << sizeof(short); cout << " 最大值:" << (numeric_limits<short>::max)(); cout << " 最小值:" << (numeric_limits<short>::min)() << endl; cout << "int: " << "所占字节数:" << sizeof(int); cout << " 最大值:" << (numeric_limits<int>::max)(); cout << " 最小值:" << (numeric_limits<int>::min)() << endl; cout << "unsigned: " << "所占字节数:" << sizeof(unsigned); cout << " 最大值:" << (numeric_limits<unsigned>::max)(); cout << " 最小值:" << (numeric_limits<unsigned>::min)() << endl; cout << "long: " << "所占字节数:" << sizeof(long); cout << " 最大值:" << (numeric_limits<long>::max)(); cout << " 最小值:" << (numeric_limits<long>::min)() << endl; cout << "unsigned long: " << "所占字节数:" << sizeof(unsigned long); cout << " 最大值:" << (numeric_limits<unsigned long>::max)(); cout << " 最小值:" << (numeric_limits<unsigned long>::min)() << endl; cout << "double: " << "所占字节数:" << sizeof(double); cout << " 最大值:" << (numeric_limits<double>::max)(); cout << " 最小值:" << (numeric_limits<double>::min)() << endl; cout << "long double: " << "所占字节数:" << sizeof(long double); cout << " 最大值:" << (numeric_limits<long double>::max)(); cout << " 最小值:" << (numeric_limits<long double>::min)() << endl; cout << "float: " << "所占字节数:" << sizeof(float); cout << " 最大值:" << (numeric_limits<float>::max)(); cout << " 最小值:" << (numeric_limits<float>::min)() << endl; cout << "size_t: " << "所占字节数:" << sizeof(size_t); cout << " 最大值:" << (numeric_limits<size_t>::max)(); cout << " 最小值:" << (numeric_limits<size_t>::min)() << endl; cout << "string: " << "所占字节数:" << sizeof(string) << endl; // << " 最大值:" << (numeric_limits<string>::max)() << " 最小值:" << (numeric_limits<string>::min)() << endl; cout << "type: " << "************size**************" << endl; system("pause"); return 0; }