Encryption

#include <stdio.h>
int main() 
{
    char text[100];
    int key, i;
    
    do 
    {
        printf("\nEnter text to encrypt (or type 'exit' to quit): ");
        fgets(text, sizeof(text), stdin);

        if (text[0] == 'e' && text[1] == 'x' && text[2] == 'i' && text[3] == 't') 
        {
            printf("\nExiting... 👋\n");
            break;
        }
        printf("Enter key : ");
        scanf("%d", &key);
        getchar();
        for (i = 0; text[i] != '\0'; i++) 
        {
            if ((text[i] >= 'A' && text[i] <= 'Z') || (text[i] >= 'a' && text[i] <= 'z'))
                text[i] += key;
        }
        printf("\n🔒 Encryption complete! Your top-secret message: %s", text);
        printf("\nIf this looks like gibberish, je suis désolé 😂\n");

    } 
    while (1);
}