将字符数字转换为C中的相应整数 [英] Convert a character digit to the corresponding integer in C

问题描述

有没有一种方法可以将字符转换为C中的整数?

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

例如，从'5'到5?

推荐答案

根据其他答复，这很好:

As per other replies, this is fine:

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

此外，对于错误检查，您可能希望首先检查isdigit(c)是否为true.请注意，您不能完全便携地对字母执行相同的操作，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

该标准保证数字'0'至'9'的char值是连续的，但不保证其他字符(例如字母).

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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