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  1. #include <stdio.h>
  2. #include <string.h>
  3. void swap(char * left, char * right)
  4. {
  5.     char temp = *left;
  6.     *left = *right;
  7.     *right = temp;
  8. }
  9. void inverse(char * str)
  10. {
  11.     size_t len = strlen(str);
  12.     size_t half_len = len / 2;
  13.     size_t i;
  14.     for(i = 0; i < half_len; ++i)
  15.         swap(&str[i], &str[len - i - 1]);
  16. }
  17. int main()
  18. {
  19.     char str[] = "1234567890";
  20.     inverse(str);
  21.     printf("%s\n", str);
  22.     return 0;
  23. }
Success #stdin #stdout 0s 2292KB
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0987654321
https://ideone.com/cH7o3d
-std=c89
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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