简介
我们写程序的时候经常遇到为某个值赋值为最大/最小值。但是有些数字很难记。这个库给你保存了你想要的极限值
参考链接
http://www.cplusplus.com/reference/limits/numeric_limits/
code
// numeric_limits example
#include <iostream> // std::cout
#include <limits> // std::numeric_limits
int main () {
std::cout << std::boolalpha;
std::cout << "Minimum value for int: " << std::numeric_limits<int>::min() << '
';
std::cout << "Maximum value for int: " << std::numeric_limits<int>::max() << '
';
std::cout << "int is signed: " << std::numeric_limits<int>::is_signed << '
';
std::cout << "Non-sign bits in int: " << std::numeric_limits<int>::digits << '
';
std::cout << "int has infinity: " << std::numeric_limits<int>::has_infinity << '
';
return 0;
}
result
Minimum value for int: -2147483648 // int 的最小值
Maximum value for int: 2147483647 // int 的最大值
int is signed: true
Non-sign bits in int: 31
int has infinity: false