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- #include <stdio.h>
- #include <stdlib.h>
- int main(){
- int UserOption = 0, EncryptKey = 0;
- char Message[140];
- printf("Choose one of the following options:\n0 - to encrypt\nanything else - to decrypt\n");
- scanf("%d", &UserOption);
- if(UserOption == 0){
- printf("Enter encryption key\n");
- scanf("%d", &EncryptKey);
- printf("\nEnter your message:\n");
- // scanf("%s", &Message);
- gets(Message);
- int i = 0;
- for(i = 0;(i < 140 && Message[i] != '\0');i++){
- Message[i] = Message[i] + EncryptKey;
- }
- printf("Encrypted message:\n");
- // for(i = 0;(i < 140 && Message[i] != '\0');i++){
- // Message[i] = Message[i] + EncryptKey;
- // }
- printf("%s\n", Message);
- }
- else{
- printf("Enter encryption key\n");
- scanf("%d", &EncryptKey);
- printf("Enter encrypted message\n");
- int i = 0;
- for(i = 0;i < 140 && Message[i] != '\0';i++){
- scanf("%s", &Message[i]);
- Message[i] = Message[i] - EncryptKey;
- }
- printf("Decrypted message:\n");
- printf("%s\n", Message);
- }
- system("pause");
- return 0;
- }
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