C++11添加了一些新的字符串转换函数:
它包括stoi (string to int)、stol (string to long)、stoll (string to longlong)、stol(string to unsigned long)、stoull (string to unsigned longlong)。值得注意的是它的缺失是stou (string to unsigned)<
如果无符号长最大值为4294967295,测试程序如何才能得到4294967297?#include <iostream>unsigned long millis_diff(unsigned long then, unsigned longnow + then : now - then;int main() unsigned long now = 2;
unsigned long<