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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. // checks whether the given string is a palindrome
  7.  
  8. int is_palindrome(string s)
  9. {
  10.   int i;
  11.   int half_size = s.size()/2;
  12.  
  13.   // check all characters (except for middle one if size is odd)
  14.   // on whether it is equal to the opposite character across the
  15.   // middle of the string
  16.  
  17.   for (i=0; i<half_size; i++)
  18.     if (s[i] != s[s.size()-1-i])
  19.       return 0;
  20.  
  21.   // if we got this far, we already know that it is a palindrome, 
  22.   // because all characters matched as they should 
  23.  
  24.   return 1;
  25. }
  26.  
  27. // main function
  28.  
  29. int main()
  30. {
  31.   string s;
  32.  
  33.   // read string s from input
  34.  
  35.   cin >> s;
  36.  
  37.   // check whether the string is a palindrome, and print out 
  38.   // the result
  39.  
  40.   if ( is_palindrome(s) )
  41.     cout << s << " is a palindrome." << endl;
  42.   else
  43.     cout << s << " is not a palindrome." << endl;
  44.  
  45.   // return 0 from main
  46.  
  47.   return 0;
  48. }
Success #stdin #stdout 0.01s 2860KB
comments (?)
stdin
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civic
stdout
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civic is a palindrome.
https://ideone.com/G6Fkq
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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