C ++子字符串返回错误的结果 [英] C++ substring returning wrong results

问题描述

我有这个字符串：

std::string date = "20121020";

我在做：

std::cout << "** Date: " << date << "\n";
std::cout << "Year: " << date.substr(0,4) << "\n";
std::cout << "Month: " << date.substr(4,6) << "\n";
std::cout << "Day: " << date.substr(6,8) << "\n";

但是获取：

** Date: 20121020
Year: 2012
Month: 1020
Day: 20

请注意，月份应为 10 ，而不是 1020 。位置是正确的，尝试一切，那就是它失败了？

Notice that month should be 10, not 1020. Positions are correct, tried everything, that is it failing?

推荐答案

std::cout << "Month: " << date.substr(4,6) << "\n";

第二个参数错误。

您可能需要：

std::cout << "Month: " << date.substr(4,2) << "\n";

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