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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. char *reverse(char *p, size_t len)
  6. {
  7.     char *first = p, *last = p + len;
  8.     while (last-- > first)
  9.     {
  10.         char tmp = *last;
  11.         *last = *first;
  12.         *first++ = tmp;
  13.     }
  14.     return p;
  15. }
  16.  
  17. int main()
  18. {
  19.     char msg[] = "This is a test message.";
  20.     printf("%s\n", reverse(msg, strlen(msg)));
  21.     return 0;
  22. }
Success #stdin #stdout 0s 2248KB
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Standard input is empty
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.egassem tset a si sihT
https://ideone.com/7801hV
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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