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  1. #include <iostream>
  2.  
  3. void swap(char& a, char& b)
  4. {
  5.     char c = a;
  6.     a = b;
  7.     b = c;
  8. }
  9.  
  10. // assumes both a and b point to enough memory to hold the 
  11. // longest of the strings.
  12. void swap_strings(char* a, char* b)
  13. {
  14.     unsigned i = 0, j = 0;
  15.     unsigned eos_count = 0; // end-of-string count.
  16.  
  17.     while (eos_count < 2)
  18.     {
  19.         swap(a[i], b[j]);
  20.  
  21.         if (!a[i])
  22.             ++eos_count;
  23.  
  24.         if (!b[j])
  25.             ++eos_count;
  26.  
  27.         ++i, ++j;
  28.     }
  29. }
  30.  
  31. int main()
  32. {
  33.     char one[32] = "one";
  34.     char three[32] = "three";
  35.  
  36.     std::cout << "one: \"" << one << "\"\n";
  37.     std::cout << "three: \"" << three << "\"\n";
  38.  
  39.     swap_strings(one, three);
  40.  
  41.     std::cout << "one: \"" << one << "\"\n";
  42.     std::cout << "three: \"" << three << "\"\n";
  43. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
one: "one"
three: "three"
one: "three"
three: "one"
https://ideone.com/9ttJig
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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