Console app menu not working in C - c

Question

guys! So I have an assignment to create a structure that includes variables based on what information I need to store and to bring out a menu that calls different functions and does different things. The problems is that for some reason my createFile function is not working at all and I've been looking for errors for 2 days and I simply cannot spot where this is coming from.
Ignore the changeStud funcion as I'm still working on it. I simply want to create my file when I enter the name for it and then chose the nnumber of the function. (in my case > enter filename> enter 1> it just loops the menu function and it should create a file)
#define _CRT_SECURE_NO_WARNINGS
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct Student {
char ime[50];
char fn[10];
int ocfiz, ocmat, ocpro;
};
char filename[20];
FILE *fd;
Student ps;
void createFile() {
fd = fopen(filename, "wb");
fclose(fd);
printf("File created!\n");
}
void readStud(Student *s) {
printf("Enter data for new student");
getchar();
printf("Enter student name:");
gets_s(s->ime);
printf("\nEnter FN:");
scanf_s("%s", s->fn);
printf("\nEnter marks for Maths, Programming, Physics");
scanf_s("%d %d %d", &s->ocmat, &s->ocpro, &s->ocfiz);
getchar();
}
void addStud() {
fd = fopen(filename, "a+b");
char c;
do {
readStud(&ps);
fwrite(&ps, sizeof(ps), 1, fd);
printf("More Students? (y/n) : ");
c = getchar(); getchar();
} while (c == 'y');
fclose(fd);
}
void writeAllStud() {
fd = fopen(filename, "rb");
printf("students in file\n");
fread(&ps, sizeof(ps), 1, fd);
while (!feof(fd)) {
printf("%s fn: %s ocmat: %d ocpro: %d ocfiz: %d", ps.ime, ps.fn, ps.ocmat, ps.ocpro, ps.ocfiz);
fread(&ps, sizeof(ps), 1, fd);
}
fclose(fd);
}/*
void changeStud() {
char fn2[50];
printf("enter FN:");
gets_s(fn2);
fd = fopen(filename, "r+b");
fread(&ps, sizeof(ps), 1, fd);
while (!feof(fd)) {
if (strcmp(ps.fn, fn2)==0) {
fseek(fd, -(long) sizeof(ps), SEEK_CUR);
fwrite(&ps, sizeof(ps, 1, fd));
break;
}
}
}*/
void Avg() {
}
void exportData() {
FILE *txt;
txt = fopen("students.txt", "wt");
fd = fopen(filename, "rb");
fread(&ps, sizeof(ps), 1, fd);
while (!feof(fd)) {
fprintf(txt, "%s %s marks fiz%d mat%d prog%d\n", ps.fn, ps.ime, ps.ocfiz, ps.ocmat, ps.ocpro);
fread(&ps, sizeof(ps), 1, fd);
}
fclose(fd);
fclose(txt);
printf("students have been written to a text file.\n");
}
void main() {
printf("Enter file name:");
gets_s(filename);
int c;
do {
printf("\nMenu:\n");
printf("0 Exit\n");
printf("1 Create file\n");
printf("2 Add new student data\n");
printf("3 Change data from FN\n");
printf("4 AVG marks for maths, programming, physics\n");
printf("5 export all AVG marks to .txt file\n");
scanf("%d", &c);
switch (c) {
case 1: createFile; break;
case 2: addStud; break;
//case 3: changeStud; break;
case 4: Avg; break;
case 5: exportData; break;
}
} while (c != 0);
}

Answer 1

i think you should use your struct variable like this:
struct Student {
char ime[50];
char fn[10];
int ocfiz, ocmat, ocpro;
}ps;
or use
struct Student ps;
instead of just student ps,or you can decleare it in main function..And passing a struct in a functin is
void readStud( struct Student *s)() {
//your code...
}