在c ++中将字符串转换为整数
问题描述：
你好
我知道它被问过很多次，但我没有找到我的具体问题的答案。
Hello I know it was asked many times but I hadn't found answer to my specific question.
我想转换只包含字符串只有十进制数：
I want to convert only string that contains only decimal numbers:
例如256可以，但256a不是。
For example 256 is OK but 256a is not.
字符串？
感谢
答
检查可选的，我可以想到的是这样：
The simplest way that makes error checking optional that I can think of is this:
char *endptr;
int x = strtol(str, &endptr, 0);
int error = (*endptr != '\0');