性格整数用C [英] Character to Integer in C

问题描述

有没有办法为一个字符转换为C中的整数？

Is there a way to convert a character to an integer in C?

例如，
'5' - > 5

for example, '5' -> 5

感谢。

推荐答案

按照对方回复，这是罚款：

As per other replies, this is fine:

char c = '5';
int x = c - '0';

此外，对于错误检查，你不妨检查一下ISDIGIT（c）是真正的第一。请注意，你不能完全可移植做字母相同的，例如：

Also, for error checking, you may wish to check isdigit(c) is true first. Note that you cannot completely portably do the same for letters, for example:

char c = 'b';
int x = c - 'a'; // x is now not necessarily 1

该标准保证了数字'0'到'9'的char值是连续的，但使得其他字符不能保证像英文字母。

The standard guarantees that the char values for the digits '0' to '9' are contiguous, but makes no guarantees for other characters like letters of the alphabet.

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