Convert char to int in C and C++

2018-06-08 02:07:44

如何在C和C ++中将char转换为int ？

Depends on what you want to do:

to read the value as an ascii code, you can write

char a = 'a';
int ia = (int)a; 
/* note that the int cast is not necessary -- int ia = a would suffice */

to convert the character '0' -> 0 , '1' -> 1 , etc, you can write

char a = '4';
int ia = a - '0';
/* check here if ia is bounded by 0 and 9 */

C and C++ always promote types to at least int . Furthermore character literals are of type int in C and char in C++.

You can convert a char type simply by assigning to an int .

char c = 'a'; // narrowing on C
int a = c;

Well, in ASCII code, the numbers (digits) start from 48 . All you need to do is:

int x = (int)character - 48;

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