Thread: Beginner - User Validation & encryption

Hello everyone,
i am writing some codes to encrypt text using ASCII codes. but i get segmentation fault at the Encryption menu when validating choice. the coding are simple. am new at C. it is stil at the beginning. stil got a long way to go. can someone tell me where i went wrong and thanks for everyone.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define FILENAMESIZE 15
#define TEXTSIZE 250

//Function Prototypes//

void optionLists();
void header();
void encryptMenu();
void decryptMenu();
void existingFile();
void newFile();



//Global Variables//

char *newline = "\n";
char *line = "-------------------------------------------------------------------\n";
char filename[FILENAMESIZE];

int main()
{
    header();
    optionLists();
    printf(line);
    printf("Enter Choice: ");
    short int choice;
    scanf("%d", &choice);

    switch (choice)
    {
        case 0:
        {
            return 0;
            break;
        }

        case 1:
        {
            encryptMenu();
            break;
        }

        case 2:
        {
            decryptMenu();
            break;
        }

        default:
        {
            printf("Wrong input!\n");
        }
    }
    return 0;
}


void header()
{
    printf(line);
    printf("MAIN MENU\n");
    printf(line);
}


void optionLists()
{
    printf("[1] Encryption\n");
    printf(newline);
    printf("[2] Decryption\n");
    printf(newline);
    printf("[0] Exit\n");

}

void encryptMenu()
{
    printf(newline);
    printf(newline);
    printf(line);
    printf("ENCRYPTION MENU\n");
    printf(line);
    printf(newline);
    printf(newline);
    printf("Enter [1] to encrypt existing file\n");
    printf(newline);
    printf("OR\n");
    printf(newline);
    printf("Enter [2] to encrypt a new text\n");
    printf(line);
    printf("Enter choice: ");
    short int choice;
    scanf("%d", choice);

    switch (choice)
    {
        case 1:
        {
            existingFile();
            break;
        }

        case 2:
        {
            newFile();
            break;
        }

        default:
        {
            printf("Wrong input!\n);");
        }
    }
}

void decryptMenu()
{

}

void existingFile()
{
    printf(newline);
    printf(newline);
    printf("Enter the current filename:\n");
    printf(">");
    scanf("%s", filename);
    FILE *fp;

    fp = fopen(filename, "r");
    if (fp)
    {
        printf("File exists\n");
        fclose(fp);
    }

    else
    {
        printf(newline);
        printf(newline);
        printf(line);
        printf("File does not exist.\n");
        //printf("Program will use", filename, "as new file to encrypt.");
        printf(line);

    }
}

void newFile()
{
    printf(newline);
    printf(newline);
    printf("Enter your text:\n");
    printf(">");
    char text[TEXTSIZE];
    scanf("%s", text);
    int i = 0;

    while (text[i] !='\0')
    {
        text[i] = text[i] + 7;
        i++;
    }

    printf("Your encrypted text is: %s \n", text);
    return;

}

wow, how did i miss that. thank you.

hi everyone. the program is rather big for me to code but am trying my best. the program does a lot of things from counting words finding longest word and so on. i am tackling each problem separately in a function. so my problem for now is that i do not know how to display the longest word that is stored in a text file and display the number of characters the longest word contains. is there someone here willing to help and guide me where to start. thanks.