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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     string str;
  6.     getline(cin, str);
  7.  
  8.     for (char &c : str) {
  9.         if ('a' <= c && c <= 'z')
  10.             c = c - 'a' + 'A';
  11.         else if ('A' <= c && c <= 'Z')
  12.             c = c - 'A' + 'a';
  13.     }
  14.  
  15.     cout << str;
  16.  
  17.     return 0;
  18. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/uffWe1
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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