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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. char* insert(char *src, char *s, char *dst)
  6. {
  7.    char *t = strdup(src + strlen(s));
  8.    strcpy(src, dst);
  9.    strcat(src, t);
  10.    free(t);
  11.    return src;
  12. }
  13.  
  14. int main(void)
  15. {
  16.    char s[BUFSIZ] = "Hello, world, Hello";
  17.    char *s1 = "Hi";
  18.    char *s2 = "Hello";
  19.  
  20.    printf("%s\n", s);
  21.  
  22.    for (char *ptr = strstr(s, s2); ptr; ptr = strstr(ptr + 1, s2))
  23.       insert(ptr, s2, s1);
  24.  
  25.    printf("%s\n", s);
  26.  
  27.    for (char *ptr = strstr(s, s1); ptr; ptr = strstr(ptr + 1, s1))
  28.       insert(ptr, s1, s2);
  29.  
  30.    printf("%s\n", s);
  31.  
  32.    for (char *ptr = strstr(s, s2); ptr; ptr = strstr(ptr + 1, s2))
  33.       insert(ptr, s2, s2);
  34.  
  35.    printf("%s\n", s);
  36.  
  37.    return 0;
  38. }
Success #stdin #stdout 0.02s 2812KB
comments (?)
stdin
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Standard input is empty
stdout
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Hello, world, Hello
Hi, world, Hi
Hello, world, Hello
Hello, world, Hello
https://ideone.com/sqrul
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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