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  1. #include <stdio.h>
  2. #include <ctype.h>
  3. int fromHex(char c) {
  4.     c = toupper(c);
  5.     if (c >= '0' && c <= '9') {
  6.         return c-'0';
  7.     } else {
  8.         return c-'A'+10;
  9.     }
  10. }
  11. char toHexDigit(int n) {
  12.     return n < 10 ? '0'+n : 'A'+n-10;
  13. }
  14. int main(void) {
  15. char myNum[] = "002A05";
  16. myNum[1] = toHexDigit(fromHex(myNum[1]) | 2);
  17. printf("%s\n", myNum);
  18. 	return 0;
  19. }
Success #stdin #stdout 0.02s 1720KB
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stdin
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Standard input is empty
stdout
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022A05
https://ideone.com/91hkDX
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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