Thread: file opening?

ok im writing a program for school and the book said to open files one way and the compiler gave me an error i messed with and changed it to a different way and it ran but then crashed trying to open the file so i must be getting half way right but im not sure?

and also yes im aware you people hate gets() but i ahve to use it for school so deal with it. and if this isnt formatted 100% like C its probably cause this on a .cpp file and also our teacher doesnt really care as this is mainly a class on data structures but with a new dialect and that is C. and im using // comments not old /**/ so dont kill me for it.

however logic and other errors feel free to let me have it.

Code:

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

struct data
{
	int cust_id;
	char cust_name[30];
	char state[3];
	char dis_code;
	double balance;
	int outstanding_orders;
};

int get_int(char msg[]);
double get_double(char msg[]);
void printfile(data records[],int elementsize);
int binary(data records[], int elementsize, char cust_id_search);


int main()
{
	data records[12];
	int response;
	int elementsize = 0;
	int found;
	int cust_id_search;
	char filename[30];
	char buf[10];
	FILE *fp;

	response = get_int("ENTER A CHOICE(use the numbers):\n1.LOAD THE FILE\n2.LIST THE FILE\n3.SEARCH THE FILE\n4.ADD A RECORD\n5.EXIT THE PROGRAM\n");
	while(response != 5)
	{
		if(response == 1)
		{
			
			printf("Enter the name of the file: \n");
			gets(filename);
			//fp = fopen(filename,"r+");
			//if(fp == NULL)
 //the above two lines fix the problem but it crashes when
 //i try and open file
			if(fp = fopen(filename,"r+")== NULL)//ERROR 1
			{
				printf("CANNOT OPEN FILE\n");
			}
			else
			{
				//fp = fopen(filename,"r+");
				fscanf(fp,"%d%s%s%c%f%d",records[elementsize].cust_id,
					records[elementsize].cust_name,
					records[elementsize].state,
					records[elementsize].dis_code,
					records[elementsize].balance,
					records[elementsize].outstanding_orders);
				while(!feof(fp))
				{
					elementsize++;
					fscanf(fp,"%d%s%s%c%f%d",records[elementsize].cust_id,
					records[elementsize].cust_name,
					records[elementsize].state,
					records[elementsize].dis_code,
					records[elementsize].balance,
					records[elementsize].outstanding_orders);
				}
			}
		}
		else if(response == 2)
		{
			printfile(records,elementsize);
		}
		else if(response == 3)
		{
			cust_id_search = get_int("Enter the customer ID youd like to search for? \n");
			found = binary(records,elementsize,cust_id_search);
			if(found == -1)
				printf("DATA NOT FOUND\n");
			else 
				printf("%d\n%s\n%s\n%c\n%f\n%d",records[found].cust_id,
				records[found].cust_name,
				records[found].state,
				records[found].dis_code,
				records[found].balance,
				records[found].outstanding_orders);
		}
		else if(response == 4)
		{
			records[elementsize+1].cust_id = get_int("enter the new records customer id\n");
			printf("Enter the customers name\n");
			gets(records[elementsize+1].cust_name);
			printf("Enter the customers State\n");
			gets(records[elementsize+1].state);
			printf("Enter the customers distribution code\n");
			gets(buf);
			records[elementsize+1].dis_code = buf[0];
			records[elementsize+1].balance = get_double("Enter the customers balance\n");
			records[elementsize+1].outstanding_orders = get_int("Enter the customers outstanding orders\n");
			elementsize++;
			fprintf(fp,"%d\n%s\n%s\n%c\n%f\n%d",records[elementsize].cust_id,
				records[elementsize].cust_name,
				records[elementsize].state,
				records[elementsize].dis_code,
				records[elementsize].balance,
				records[elementsize].outstanding_orders);
		}
		else;
		}
		fclose(fp);
return 0;
}

void printfile(data records[],int elementsize)
{
	for(int x = 0;x < elementsize;x++)
		printf("%d\n%s\n%s\n%c\n%f\n%d\n",records[x].cust_id,
					records[x].cust_name,
					records[x].state,
					records[x].dis_code,
					records[x].balance,
					records[x].outstanding_orders);
}	
	
int binary(data records[], int elementsize, char cust_id_search)
{
	int first = 0;
	int last = elementsize - 1;
	int found = 0;
	int mid;
	while(first <= last && found == 0)
	{
		mid = (first + last)/2;
		if(records[mid].cust_id == cust_id_search)
		{
			found = 1;
		}
		else if(records[mid].cust_id < cust_id_search)
		{
			first = mid + 1;
		}
		else 
			last = mid - 1;
	}
	if(found == 0)
		mid = -1;
	else;
	return mid;
}


//gets an integer from the keyboard
int get_int(char msg[])
{
	char buf[40];
    printf(msg);
    gets(buf);
	return atoi(buf);
}

//gets a double from the keyboard
double get_double(char msg[])
{
    char buf[40];
    printf(msg);
    gets(buf);
    return atof(buf);
}

c:\skool\program 3\proj 3\assignment3.cpp(43): error C2440: '=' : cannot convert from 'bool' to 'FILE *'