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BAI1 safest cryptocurrency exchange

From Nguyen Gia Hy, 1 Month ago, written in Plain Text.
URL https://pastebin.pl/view/eac4b7e4
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  1. #include <iostream>
  2.  
  3. using namespace std;\
  4.  
  5. int isLower(char c){
  6.     if (c >= 'a' && c <= 'z') {
  7.         return 1;
  8.     }
  9.     else {
  10.         return 0;
  11.     }
  12. }
  13.  
  14. int isUpper (char c) {
  15.     if (c >= 'A' && c <= 'Z') {
  16.         return 1;
  17.     }
  18.     else {
  19.         return 0;
  20.     }
  21. }
  22.  
  23. int isAlpha (char c) {
  24.     if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z') {
  25.         return 1;
  26.     }
  27.     else {
  28.         return 0;
  29.     }
  30. }
  31.  
  32. int isDigit (char c) {
  33.     if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0' && c <= '9'){
  34.         return 0;
  35.     }
  36.     else {
  37.         return 1;
  38.     }
  39. }
  40.  
  41. int main()
  42. {
  43.     freopen("BAI1.INP", "r", stdin);
  44.     freopen("BAI1.OUT", "w", stdout);
  45.     char c;
  46.     cin>>c;
  47.     cout<<isLower(c)<<endl;
  48.     cout<<isUpper(c)<<endl;
  49.     cout<<isAlpha(c)<<endl;
  50.     cout<<isDigit(c)<<endl;
  51.     return 0;
  52. }
  53.  

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