Help

[Rakansen]

Hi im new and i was wondering if anyone could help me with this code

/* *******************************
* author:kevin peters 
* revison #:0.1
**********************************/
#include <stdio.h>
#include <stdlib.h>

#define QUIT 5
    char filename[80];
	int get_menu( void );
	FILE *fp;

main()
{
	
	int choice = 0;
	/* while() makes sure choice does not equal QUIT */
	while (choice != QUIT)
	{
		
		choice = get_menu();
		if (choice == 1)
		{
			// creates file
			puts("Enter a name for the file:");
			gets(filename);
			if ((fp = fopen(filename, "w")) == NULL)
			{
				fprintf(stderr, "Error creating file %s", filename);
				exit(1);
			}
			
			
			fclose(fp);
		}
		if (choice == 2)
		{
			//edits previous file
			puts("Enter a file to edit:");
			gets(filename);
			if ((fp = fopen(filename, "w")) == NULL)
			{
				fprintf(stderr, "Error opening file.");
				exit(1);
			}
			fclose(fp);
		}
		if (choice == 3)
		{
			
			//reads a file
			puts("Enter a file to read:");
			gets(filename);
			if ((fp = fopen(filename, "r")) == NULL)
			{
				fprintf(stderr, "No exsiting file.");
				exit(1);
			}
			fclose(fp);
		}
		if (choice == 4)
		{
			// deletes previous file
			puts("Enter a filename to remove: ");
			gets(filename);
			if ( remove(filename) == 0)
				printf("Succesful deletion of %s", filename);
			else
				fprintf(stderr, "Error deleting file %s", filename);
			exit(1);
			
		}
		
	}
	return (0);
}

int get_menu( void )
{
	int selection = 0;
	/* display menu() to screen */
	do
	{
		
		printf("\n");
		printf("1 - Create entry\n");
		printf("2 - Edit previous entry\n");
		printf("3 - Read previous entry\n");
		printf("4 - Delete previous entry\n");
		printf("5 - Quit\n");
		printf("\n");
		printf("\nEnter what you would like to do: ");
	
		scanf("%d", &selection);
		
	}
	while (selection < 1 || selection > 5);
	return selection;
}

i keep getting warnings and if this helps too i edit it in visual c++ and compile with borlands c/c++ compiler because visual c++ compiler doesnt work for me