fork download
copy 
  1. #include <stdio.h>
  2.  
  3. const char *find_a_substring(const char *string, const char *substring)
  4. {
  5.     if (string == NULL || substring == NULL ||
  6.        *substring == 0 || *string == 0) return NULL;
  7.     for(const char * t = substring;*string;++string, t = substring)
  8.     {
  9.         for(const char *s = string; *s && *t && *t == *s; ++s, ++t);
  10.         if (*t == 0) return string;
  11.     }
  12.     return NULL;
  13. }
  14.  
  15. int main(int argc, const char * argv[])
  16. {
  17.     printf("%s\n",find_a_substring("Hello world!","o w"));
  18.     printf("%s\n",find_a_substring("Hello world!","H"));
  19.     printf("%s\n",find_a_substring("Hello world!","!"));
  20.     printf("%s\n",find_a_substring("Hello world!","world!!!"));
  21. }
  22.  
Success #stdin #stdout 0s 5564KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
o world!
Hello world!
!
(null)
https://ideone.com/Biuxly
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!