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  1. #include <stdio.h>   
  2. #include <string.h>   
  3.  
  4. void reverse(char *str)
  5. {
  6.     if (!str || !(*str)) return;
  7.  
  8.     char *end = str + strlen(str) - 1;
  9.  
  10.     while (str < end) {
  11.         char tmp = *str;
  12.         *str++ = *end;
  13.         *end-- = tmp;
  14.     }
  15. }
  16.  
  17. int main(void)
  18. {
  19.     char buffer[] = "hello";
  20.     reverse(buffer);
  21.     printf("%s",buffer);
  22.  
  23.     return 0;
  24. }
Success #stdin #stdout 0s 4480KB
comments (?)
stdin 
Standard input is empty
stdout 
olleh
https://ideone.com/aOiPSE
language:
C99 (gcc 8.3)
created:
7 years ago
visibility:
public

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