🔄⚡Beginner

Char to Int Conversion

Convert character to integer

Convert character to integer (digit or ASCII value).

Program Code

char_to_int.c

1#include <stdio.h>
2
3int main() {
4    // Character digit to integer
5    char ch = '7';
6    int digit = ch - '0';
7    printf("'%c' as digit: %d\n", ch, digit);
8    
9    // Character to ASCII value
10    char letter = 'A';
11    int ascii = (int)letter;
12    printf("'%c' as ASCII: %d\n", letter, ascii);
13    
14    // String of digits to integer
15    char str[] = "456";
16    int num = 0;
17    for (int i = 0; str[i]; i++) {
18        num = num * 10 + (str[i] - '0');
19    }
20    printf("\"%s\" as integer: %d\n", str, num);
21    
22    return 0;
23}