Fee Management System In C

#include<stdio.h>

#include<conio.h>

void main()

{

FILE *fp, *ft;

char another, choice;

struct fee

{       int r_no;

     char name[40];

     char add[40];

     char f_name[40];

     char stream[40];

     long int d_fee;

};

struct fee f;

long int amount,flag;

long int total=2000;

long int pending=0;

long int recsize;

char stream[40];

int r_no;

fp=fopen("FEE2.DAT","rb+");

if(fp==NULL)

{

     fp=fopen("FEE2.DAT","wb+");

     if(fp==NULL)

     {

            puts("Cannot open file");

            exit(1);

     }

}

recsize = sizeof(f);

while(1)

{

     clrscr();

     gotoxy(30,10);

     printf("1. Student detail");

     gotoxy(30,12);

     printf("2. Display Record");

     gotoxy(30,14);

     printf("3. deposite fee");

     gotoxy(30,16);

     printf("4. Pending fee");

     gotoxy(30,18);

     printf("5. Delete Record");

     gotoxy(30,20);

     printf("0.Exit");

     gotoxy(30,22);

     printf("Your choice");

     fflush(stdin);

     choice = getche();

     switch(choice)

     {

            case '1':

            fseek(fp,0,SEEK_END);

            another = 'Y';

            while((another == 'Y') || (another == 'y'))

            {

                        printf("\nEnter Roll_no");

                        scanf("%d", &f.r_no);

                        printf("\nEnter Name");

                        scanf(" %s",f.name);

                        printf("\nEnter Address");

                        scanf("%s",f.add);

                        printf("\nEnter Father name");

                        scanf("%s",f.f_name);

                        printf("\nEnter deposited fee");

                        scanf("%ld", &f.d_fee);

                        printf("\nEnter Stream");

                        scanf("%s",f.stream);

                        fwrite(&f, recsize, 1, fp);

                        printf("\nCreate another Student Record(Y/N)");

                        fflush(stdin);

                        another = getche();

            }

            break;

            case '2':

            clrscr();

            rewind(fp);

            printf("Roll no\tname\tAddress\tFather name\tStream\tdeposited fee\tTotal amount");

            while(fread(&f, recsize, 1, fp) == 1)

                        printf("\n%d\t%s\t%s\t%s\t%s\t%ld\t%ld", f.r_no,f.name, f.add, f.f_name,f.stream, f.d_fee,total);

            getch();

            break;

            case '3':

            another='Y';

            while(another=='Y')

            {

                        printf("\nEnter Roll number to check balance");

                        scanf("%d",&r_no);

                        printf("\nEnter the Stream");

                        scanf("%s",stream);

                        rewind(fp);

                        flag=0;

                        while(fread(&f, recsize, 1, fp)==1)

                        {

                                    if((f.r_no==r_no)&&(strcmp(f.stream,stream)==0))

                                    {

                                    if(f.d_fee<=total)

                                    {

                                                flag=1;

                                                printf("\nEnter amount to deposite");

                                                scanf("%ld",&amount);

                                                f.d_fee=f.d_fee + amount;

                                                fseek(fp, -recsize, SEEK_CUR);

                                                fwrite(&f,recsize,1,fp);

                                                break;

                                    }

                                    }}

                                    if(flag==0)

                                    {

                                                printf("sorry !! invalid rollno");

                                                getch();

                                    }

                        printf("deposite more amount");

                        fflush(stdin);

                        another=getche();

                }

                break;

            case '4':

            another='Y';

            while(another=='Y')

            {

                        printf("\nEnter roll number to check pending amount");

                        scanf("%d",&r_no);

                        printf("\nEnter the Stream");

                        scanf("%s",stream);

                        rewind(fp);

                        flag=0;

                        while(fread(&f, recsize, 1, fp)==1)

                        {

                                    flag=1;

                                    if((f.r_no==r_no)&&(strcmp(f.stream,stream)==0))

                                    {

                                                pending=total-f.d_fee;

                                                printf("\nYour pending amount is %ld",pending);

                                                f.d_fee=f.d_fee+pending;

                                                getch();

                                    }

                        }

                        if(flag==0)

                        {

                                    printf("Sorry !! Invalid roll number");

                                    getch();

                        }

                        fflush(stdin);

                        another=getche();

            }

            break;

            case '5':

            another='Y';

            while(another=='Y')

            {

                        printf("\nEnter roll number to delete");

                        scanf("%d",&r_no);

                        ft = fopen("TEMP.DAT","wb");

                        rewind(fp);

                        while(fread(&f, recsize, 1, fp) == 1)

                        {

                                    if(f.r_no!=r_no)

                                                fwrite(&f, recsize, 1, fp);

                        }

                        fclose(fp);

                        fclose(ft);

                        remove("FEE2.DAT");

                        rename("TEMP.DAT", "FEE2.DAT");

                        fp=fopen("FEE2.DAT", "rb+");

                        printf("Delete another record(Y/N)");

                        fflush(stdin);

                        another = getche();

            }

            break;

            case '0':

            fclose(fp);

            exit();

     }

}}