error while using file i/o operation in ansi c

[ddrdushy]

i have a file as STUDENT.TXT, i have to do a file manipulation function in this progarmme,, i can't do all the manipulation in this programme,, what is the wrong ?

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
 
struct student
{
int rno;
char name[25];
int m1,m2;
}s1;
 
void main()
{
int ch, n;
 
FILE *fp1,*fp2;
 
do 
{
clrscr();
printf("\n 1.insertation");
printf("\n 2.Deletion");
printf("\n 3.modification");
printf("\n 4.View");
printf("\n 5.exit");
 
printf("\n Enter Your Choice:-\n");
scanf("%d",&ch);
 
 
switch(ch) 
{
case 1:
fp1=fopen("STUDENT.TXT","a+");
printf("\nEnter The Roll no:-\n ");
scanf("%d",&s1.rno);
printf("\nEnter The Name:-\n ");
scanf("%s",s1.name);
printf("\nEnter The m1:-\n ");
scanf("%d",&s1.m1);
printf("\nEnter The m2:-\n ");
scanf("%d",&s1.m2);
 
fprintf(fp1,"\nRoll no:-%d\n ",s1.rno);
fprintf(fp1,"\nName:-%s\n ",s1.name);
fprintf(fp1,"\nm1:-%d\n ",s1.m1);
fprintf(fp1,"\nm2:-%d\n ",s1.m2);
 
fclose(fp1);
printf("\n Record is successfully Added");
getch();
break;
 
case 2:
printf("Enter the roll no to be deleted\n");
scanf("%d",&n);
fp1=fopen("STUDENT.TXT","r");
fp2=fopen("DDD.TXT","w");
 
while(!feof(fp1))
{
fscanf(fp1,"%d",&s1.rno);
fscanf(fp1,"%s",s1.name);
fscanf(fp1,"%d",&s1.m1);
fscanf(fp1,"%d",&s1.m2);
 
if (s1.rno!=n)
{
fprintf(fp2,"\nRoll no:-%d\n ",s1.rno);
fprintf(fp2,"\nName:-%s\n ",s1.name);
fprintf(fp2,"\nm1:-%d\n ",s1.m1);
fprintf(fp2,"\nm2:-%d\n ",s1.m2);
}
}
printf("This record is deleted!!");
fclose(fp1);
fclose(fp2);
remove("STUDENT.TXT");
getch();
break;
 
 
case 3:
printf("Enter the roll no to modification\n");
scanf("%d",&n);
fp1=fopen("STUDENT.TXT","r");
fp2=fopen("DDD.TXT","w");
 
while(!feof(fp1))
{
fscanf(fp1,"%d",&s1.rno);
fscanf(fp1,"%s",s1.name);
fscanf(fp1,"%d",&s1.m1);
fscanf(fp1,"%d",&s1.m2);
 
if (s1.rno!=n)
{
fprintf(fp2,"\nRoll no:-%d\n ",s1.rno);
fprintf(fp2,"\nName:-%s\n ",s1.name);
fprintf(fp2,"\nm1:-%d\n ",s1.m1);
fprintf(fp2,"\nm2:-%d\n ",s1.m2);
}
else
{
printf("\n Old data Are:-\n");
printf("%d\n%s\n%d\n%d\n",s1.rno,s1.name,s1.m1,s1.m2);
printf("Enter the new data \n");
printf("\nEnter The Roll no:-\n ");
scanf("%d",&s1.rno);
printf("\nEnter The Name:-\n ");
scanf("%s",s1.name);
printf("\nEnter The m1:-\n ");
scanf("%d",&s1.m1);
printf("\nEnter The m2:-\n ");
scanf("%d",&s1.m2);
 
 
fprintf(fp2,"\nRoll no:-%d\n ",s1.rno);
fprintf(fp2,"\nName:-%s\n ",s1.name);
fprintf(fp2,"\nm1:-%d\n ",s1.m1);
fprintf(fp2,"\nm2:-%d\n ",s1.m2);}
}
printf("\nthis record is updated");
fclose(fp1);
fclose(fp2);
remove("STUDENT.TXT");
rename("DDD.TXT","STUDENT.TXT");
getch();
break;
 
 
case 4:
fp1=fopen("STUDENT.TXT","r");
while(!feof(fp1))
{
fscanf(fp1,"%d",&s1.rno);
fscanf(fp1,"%s",s1.name);
fscanf(fp1,"%d",&s1.m1);
fscanf(fp1,"%d",&s1.m2);
 
printf("\nRoll no:- %d\n ",s1.rno);
printf("\nName:- %s \n ",s1.name);
printf("\nm1:- %d\n ",s1.m1);
printf("\nm2:- %d\n ",s1.m2);
}
fclose(fp1);
getch();
break;
 
case 5:
exit(0);
break;
 
}
}
while(ch!=5);
getch();
}

[Rabbit]

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