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  1. /**********************************************
  2.  *                                            *
  3.  *      	ADITYA KUMAR SINGH                *
  4.  *               (hangover)                   *
  5.  *           	  2nd YEAR                    *
  6.  * INDIAN INSTITUTE OF INFORMATION TECHNOLOGY *
  7.  *           	  ALLAHABAD 				  *
  8.  *                                            *
  9.  **********************************************/
  10.  
  11. #include <bits/stdc++.h>
  12. #define ll long long int
  13. #define MOD 1000000007
  14.  
  15. using namespace std;
  16. char st[10000000], s[1000000];
  17.  
  18. int main(){
  19.     cout << "Enter your Ceaser Chipher to decrypt:\n";
  20.     cin >> s;
  21.     ll t;
  22.     t = strlen(s);
  23.     ll n;
  24.     strcpy(st,s);
  25.     /*cout << "Shift of how many characters:\n";
  26.     cin >> n;*/
  27.     cout << "Shift in which direction (r(right) or l(left)) :\n";
  28.     char c;
  29.     cin >> c;
  30.     srand(time(NULL));
  31.     n = (rand() % 25) + 1;
  32.     cout << "Your String is shifted by:" << n <<endl;
  33.     ll f;
  34.     if(c=='r'){
  35.         for(int i=0;i<strlen(st);i++){
  36.             f = st[i] + n;
  37.             if(f>122)
  38.                 f = f - 26;
  39.             st[i] = f;
  40.         }
  41.     }
  42.     else if(c=='l'){
  43.         for(int i=0;i<strlen(st);i++){
  44.             f = st[i] - n;
  45.             if(f<97)
  46.                 f = f + 26;
  47.             st[i] = f;
  48.         }
  49.     }
  50.     cout <<"Your encrypted String :-> "<< st <<endl;
  51.     return 0;
  52. }
  53.  
Success #stdin #stdout 0s 13840KB
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stdin
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aditya
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stdout
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Enter your Ceaser Chipher to decrypt:
Shift in which direction (r(right) or l(left)) :
Your String is shifted by:24
Your encrypted String :-> ybgrwy
https://ideone.com/6AzY2i
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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