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  1. #include <stdio.h>
  2.  
  3. int change_char( char *str, const char a, const char b) {
  4.     int n = 0;
  5.     if ( str ) {
  6.         while ( *str ) {
  7.             if ( *str == a ) {
  8.                 *str = b; // Can I modify the value pointed by the pointer?
  9.                 ++n;
  10.             }
  11.         ++str;  // Can I modify the pointer?
  12.         }
  13.     }
  14.     return n;
  15. }
  16.  
  17. int main(void) {
  18. 	char *test;
  19. 	test = malloc(13);
  20. 	strcpy(test,"Hello world!");
  21. 	change_char(test, 'o', 'X');
  22. 	printf("%s\n",test);   // it will output HellX wXrld!
  23.  
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin 
Standard input is empty
stdout 
HellX wXrld!
https://ideone.com/0dlUAJ
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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