在 C++ 中将字符串转换为整数
你好我知道有人问了很多次，但我没有找到具体问题的答案.
Hello I know it was asked many times but I hadn't found answer to my specific question.
我只想转换只包含十进制数字的字符串:
I want to convert only string that contains only decimal numbers:
例如 256 可以，但 256a 不行.
For example 256 is OK but 256a is not.
不检查字符串可以吗?
谢谢
推荐答案
我能想到的使错误检查成为可选的最简单方法是:
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 != '');
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