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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<string.h>
  4.  
  5. char *str_replace(char *search , char *replace , char *subject) {
  6.     char  *p = NULL , *old = NULL , *new_subject = NULL ;
  7.     int c = 0 , search_size;
  8.     search_size = strlen(search);
  9.     //Count how many occurences
  10.     for (p = strstr(subject , search) ; p != NULL ; p = strstr(p + search_size , search)) {
  11.         c++;
  12.     }
  13.     //Final size
  14.     c = ( strlen(replace) - search_size )*c + strlen(subject);
  15.     //New subject with new size
  16.     new_subject = malloc( c );
  17.     //Set it to blank
  18.     strcpy(new_subject , "");
  19.     //The start position
  20.     old = subject;
  21.     for (p = strstr(subject , search) ; p != NULL ; p = strstr(p + search_size , search)) {
  22.         //move ahead and copy some text from original subject , from a certain position
  23.         strncpy(new_subject + strlen(new_subject) , old , p - old);
  24.         //move ahead and copy the replacement text
  25.         strcpy(new_subject + strlen(new_subject) , replace);
  26.         //The new start position after this search match
  27.         old = p + search_size;
  28.     }
  29.     //Copy the part after the last search match
  30.     strcpy(new_subject + strlen(new_subject) , old);
  31.     return new_subject;
  32. }
  33.  
  34. int main() {
  35.     char original[100], final[100];
  36.     printf("digite:");
  37.     fgets(original, sizeof(original), stdin);
  38.     strcpy(final, str_replace("toda", "0", original));
  39.     printf("[%s]", final);
  40. }
  41.  
  42. //https://pt.stackoverflow.com/q/209982/101
Success #stdin #stdout 0s 10304KB
comments (?)
stdin
copy 
toda toda toda toda toda toda toda toda
stdout
copy 
digite:[0 0 0 0 0 0 0 0
]
https://ideone.com/fA9P7F
language:
C99 (gcc 8.3)
created:
6 years ago
visibility:
public

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