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  1. #include <iostream>
  2.  
  3. // assumes both a and b point to enough memory to hold the 
  4. // longest of the strings.
  5. void swap_strings(char a[], char b[])
  6. {
  7.     unsigned i = 0, j = 0;
  8.     unsigned eos_count = 0; // end-of-string count.
  9.  
  10.     while (eos_count < 2)
  11.     {
  12.         char c = a[i] ;
  13.         a[i] = b[j] ;
  14.         b[j] = c ;
  15.  
  16.         if (!a[i])
  17.             ++eos_count;
  18.  
  19.         if (!b[j])
  20.             ++eos_count;
  21.  
  22.         ++i, ++j;
  23.     }
  24. }
  25.  
  26. int main()
  27. {
  28.     char one[32] = "one";
  29.     char three[32] = "three";
  30.  
  31.     std::cout << "one: \"" << one << "\"\n";
  32.     std::cout << "three: \"" << three << "\"\n";
  33.  
  34.     swap_strings(one, three);
  35.  
  36.     std::cout << "one: \"" << one << "\"\n";
  37.     std::cout << "three: \"" << three << "\"\n";
  38. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin
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Standard input is empty
stdout
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one: "one"
three: "three"
one: "three"
three: "one"
https://ideone.com/TFh0cR
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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