C Lan Tu Sofia Work

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
FILE *writeFile(char *fname);
int readFile(FILE *fp, char *fname);
FILE *PrintFile(FILE *fp, char *fname);
int main()
{
    FILE *text, *output;
    char fname[20];
    char fileToOpen[20], fileToWriteResult[20];
    char outname[] = "tmp.txt";
    int mode;
    char *menu[] = { "MENU",
        "1. 4etene na programata i azpis na otgovora vuv fail",
        "2. 4etene na programa ot fail i izvejdane na ekrana ",
        "3. 4etene na programa ot klaviaturata i zapisvane viv fail zadaden ot potrebitelq"
    };
    do {
        system("cls");
        for (int i = 0; i < 4; i++) {
            printf("\n%s\n", menu[i]);
        }
        scanf("%d", &mode);
        switch (mode)
        {
        case 1:
            printf("Vuvedete faila koito iskate da otvorite:\n");
            scanf("%s", fileToOpen);
            printf("Vuvedete faila koito iskate da zapishete: \n");
            scanf("%s", fileToWriteResult);
            readFile(text, fileToOpen);
            if (output == NULL)
                printf("Ne moje da otvori fajla.\n");
            system("pause");
            break;
        case 2:
            printf("Vuvedete faila koito iskate da otvorite:\n");
            scanf("%s", fileToOpen);
            readFile(text, fileToOpen);
            PrintFile(text, fname);
            system("pause");
            break;
        case 3:

            system("pause");
            break;
        default:
            printf("\nGreshen izbor!\n");
            system("pause");
        }

    } while (mode != 4);
    return 0;
}

int readFile(FILE *fp, char *fname)
{
    char s[81];
    int num_wrd = 0;
    fp = fopen(fname, "r");
    if (!fp) return 0;
    while (fgets(s, 80, fp) != NULL)
        fputs(s, stdout);
    fclose(fp);
    return 0;
}

FILE *PrintFile(FILE *fp, char *fname) {
    FILE *tmp;
    char str[81];
    fp = fopen(fname, "r");
    if (!fp) printf("Ne moje da otvori fajla.\n");;
    while (fgets(str, 80, fp) != NULL)
        printf("%s", str);
    fclose(fp);
}
FILE *writeFile(char *fname)
{
    FILE *fp;
    char s[81];
    fp = fopen(fname, "w");
    if (!fp)return NULL;
    printf("Vyvedete nizove, za kraj: Ctrl/Z.\n");
    fflush(stdin);
    while (fgets(s, 80, stdin) != NULL)
        fputs(s, fp);
    fclose(fp);
    return fp;
}