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Oct 18th, 2018
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C 1.03 KB | None | 0 0
  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(){
  5.     int UserOption = 0, EncryptKey = 0;
  6.     char Message[140];
  7.     printf("Choose one of the following options:\n0 - to encrypt\nanything else - to decrypt\n");
  8.     scanf("%d", &UserOption);
  9.     if(UserOption == 0){
  10.         printf("Enter encryption key\n");
  11.         scanf("%d", &EncryptKey);
  12.         printf("\nEnter your message:\n");
  13.         Message[0] = 0;
  14.         int i = 0;
  15.         for(i = 0;(i < 140 && Message[i] != '\0');i++){
  16.             scanf("%s", &Message[i]);
  17.             Message[i] = Message[i] + EncryptKey;
  18.             }
  19.         printf("Encrypted message:\n");
  20. //      for(i = 0;(i < 140 && Message[i] != '\0');i++){
  21. //          Message[i] = Message[i] + EncryptKey;
  22. //  }
  23.             printf("%s\n", Message);
  24.        
  25.     }
  26.     else{
  27.         printf("Enter encryption key\n");
  28.         scanf("%d", &EncryptKey);
  29.         printf("Enter encrypted message\n");
  30.         int i = 0;
  31.         for(i = 0;i < 140 && Message[i] != '\0';i++){
  32.             scanf("%s", &Message[i]);
  33.             Message[i] = Message[i] - EncryptKey;
  34.         }
  35.         printf("Decrypted message:\n");
  36.         printf("%s\n", Message);       
  37.     }
  38.     system("pause");
  39.     return 0;
  40. }
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