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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. char *reverse(char *str)
  5. {
  6.     char tmp, *src, *dst;
  7.     size_t len;
  8.  
  9.     if (str != NULL)
  10.     {
  11.         len = strlen(str);
  12.         if (len > 1)
  13.         {
  14.             src = str;
  15.             dst = src + len - 1;
  16.  
  17.             while (src < dst)
  18.             {
  19.                 tmp = *src;
  20.                 *src++ = *dst;
  21.                 *dst-- = tmp;
  22.             }
  23.         }
  24.     }
  25.     return str;
  26. }
  27.  
  28. int main(int argc, char *argv[])
  29. {
  30.     char *str[] = {"a", "ab", "abc", "test", "another test"};
  31.     int i;
  32.     char s[10000];
  33.     for (i=0; i < sizeof(str) / sizeof(str[0]); i++)
  34.     {
  35.         strcpy (s, str[i]);
  36.         printf("Original: '%s'\n", str[i]);
  37.         printf("Reversed: '%s'\n", reverse(s));
  38.     }
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 9432KB
comments (?)
stdin
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Standard input is empty
stdout
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Original: 'a'
Reversed: 'a'
Original: 'ab'
Reversed: 'ba'
Original: 'abc'
Reversed: 'cba'
Original: 'test'
Reversed: 'tset'
Original: 'another test'
Reversed: 'tset rehtona'
https://ideone.com/Xmn4fV
language:
C99 (gcc 8.3)
created:
7 years ago
visibility:
public

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