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  1. #include <iostream>
  2. #include <string.h>
  3.  
  4. void reverse( char *s )
  5. {
  6.     if ( !s )
  7.         return;
  8.  
  9.     char *e = s + strlen( s ) - 1;
  10.     while ( s < e )
  11.     {
  12.         *e ^= *s;
  13.         *s ^= *e;
  14.         *e-- ^= *s++;
  15.     }
  16. }
  17. int main() {
  18. 	// your code goes here
  19. 	char* s1 = "123";
  20. 	char* s2 = "";
  21.     char s3[4];
  22. memcpy(s3, s1, strlen(s1)+1);
  23.  
  24. 	std::cout << s3 << " - " << std::endl;
  25. 	reverse(s3);
  26. 	std::cout << s3 << std::endl;
  27.  
  28. memcpy(s3, s2, strlen(s2)+1);
  29. 	std::cout << s3 << " - " << std::endl;
  30. 	reverse(s2);
  31. 	std::cout << s3 << std::endl;
  32. 	return 0;
  33. }
Success #stdin #stdout 0s 15232KB
comments (?)
stdin
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Standard input is empty
stdout
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123 - 
321
 -
https://ideone.com/p0mNHc
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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