Wednesday, 8 March 2017

Student file to insert,display,delete,update,sort records using C

#include<stdio.h>
struct student
{
int rollno;
char name[30];
float mark;
}stud;
//    FUNCTION TO INSERT RECORDS TO THE FILE
void insert()
{
FILE *fp;
fp = fopen("Record", "a");
printf("Enter the Roll no   :");
scanf("%d", &stud.rollno);
printf("Enter the Name      :");
scanf("%s", &stud.name);
printf("Enter the mark      :");
scanf("%f", &stud.mark);
fwrite(&stud, sizeof(stud), 1, fp);
fclose(fp);
}
//    FUNCTION TO DISPLAY RECORDS
void disp()
{
FILE *fp1;
fp1 = fopen("Record", "r");
printf("\nRoll Number\tName\tMark\n\n");
while (fread(&stud, sizeof(stud), 1, fp1))
printf("  %d\t\t%s\t%.2f\n", stud.rollno, stud.name, stud.mark);
fclose(fp1);
}
//    FUNCTION TO SEARCH THE GIVEN RECORD
void search()
{
FILE *fp2;
int r, s, avl;
printf("\nEnter the Roll no you want to search  :");
scanf("%d", &r);
avl = avlrollno(r);
if (avl == 0)
printf("Roll No %d is not available in the file\n",r);
else
{
fp2 = fopen("Record", "r");
while (fread(&stud, sizeof(stud), 1, fp2))
{
s = stud.rollno;
if (s == r)
{
printf("\nRoll no = %d", stud.rollno);
printf("\nName    = %s", stud.name);
printf("\nMark    = %.2f\n", stud.mark);
}
}
fclose(fp2);
}
}
//    FUNCTION TO DELETE A RECORD


void deletefile()
{
FILE *fpo;
FILE *fpt;
int r, s;
printf("Enter the Roll no you want to delete :");
scanf("%d", &r);
if (avlrollno(r) == 0)
printf("Roll no %d is not available in the file\n", r);
else
{
fpo = fopen("Record", "r");
fpt = fopen("TempFile", "w");
while (fread(&stud, sizeof(stud), 1, fpo))
{
s = stud.rollno;
if (s != r)
fwrite(&stud, sizeof(stud), 1, fpt);
}
fclose(fpo);
fclose(fpt);
fpo = fopen("Record", "w");
fpt = fopen("TempFile", "r");
while (fread(&stud, sizeof(stud), 1, fpt))
fwrite(&stud, sizeof(stud), 1, fpo);
printf("\nRECORD DELETED\n");
fclose(fpo);
fclose(fpt);
}

}
//    FUNCTION TO UPDATE THE RECORD
void update()
{
int avl;
FILE *fpt;
FILE *fpo;
int s, r, ch;
printf("Enter roll number to update:");
scanf("%d", &r);
avl = avlrollno(r);
if (avl == 0)
{
printf("Roll number %d is not Available in the file", r);
}
else
{
fpo = fopen("Record", "r");
fpt = fopen("TempFile", "w");
while (fread(&stud, sizeof(stud), 1, fpo))
{
s = stud.rollno;
if (s != r)
fwrite(&stud, sizeof(stud), 1, fpt);
else
{
printf("\n\t1. Update Name of Roll Number %d", r);
printf("\n\t2. Update Mark of Roll Number %d", r);
printf("\n\t3. Update both Name and Mark of Roll Number %d", r);
printf("\nEnter your choice:");
scanf("%d", &ch);
switch (ch)
{
case 1:
printf("Enter Name:");
scanf("%s", &stud.name);
break;
case 2:
printf("Enter Mark : ");
scanf("%f", &stud.mark);
break;
case 3:
printf("Enter Name: ");
scanf("%s", &stud.name);
printf("Enter Mark: ");
scanf("%f", &stud.mark);
break;
default:
printf("Invalid Selection");
break;
}
fwrite(&stud, sizeof(stud), 1, fpt);
}
}
fclose(fpo);
fclose(fpt);
fpo = fopen("Record", "w");
fpt = fopen("TempFile", "r");
while (fread(&stud, sizeof(stud), 1, fpt))
{
fwrite(&stud, sizeof(stud), 1, fpo);
}
fclose(fpo);
fclose(fpt);
printf("RECORD UPDATED");
}
}
/* FUNCTION TO SORT THE RECORD */
void sort()
{
int a[20], count = 0, i, j, t, c;
FILE *fpo;
fpo = fopen("Record", "r");
while (fread(&stud, sizeof(stud), 1, fpo))
{
a[count] = stud.rollno;
count++;
}
c = count;
for (i = 0; i<count - 1; i++)
{
for (j = i + 1; j<count; j++)
{
if (a[i]>a[j])
{
t = a[i];
a[i] = a[j];
a[j] = t;
}
}
}
printf("Roll No.\tName\t\tMark\n\n");
count = c;
for (i = 0; i<count; i++)
{
rewind(fpo);
while (fread(&stud, sizeof(stud), 1, fpo))
{
if (a[i] == stud.rollno)
printf("\n %d\t\t %s \t\t %2f",stud.rollno, stud.name, stud.mark);
}

}
}
//    FUNCTION TO CHECK GIVEN ROLL NO IS AVAILABLE //
int avlrollno(int rno)
{
FILE *fp;
int c = 0;
fp = fopen("Record", "r");
while (!feof(fp))
{
fread(&stud, sizeof(stud), 1, fp);

if (rno == stud.rollno)
{
fclose(fp);
return 1;
}
}
fclose(fp);
return 0;
}
//FUNCTION TO CHECK THE FILE IS EMPTY OR NOT
int empty()
{
int c = 0;
FILE *fp;
fp = fopen("Record", "r");
while (fread(&stud, sizeof(stud), 1, fp))
c = 1;
fclose(fp);
return c;
}
// MAIN PROGRAM
void main()
{
int c, emp;
do
{
printf("\n\t---Select your choice---------\n");
printf("\n\t1. INSERT\n\t2. DISPLAY\n\t3. SEARCH");
printf("\n\t4. DELETE\n\t5. UPDATE\n\t6. SORT");
printf("\n\t7. EXIT");
printf("\n\n------------------------------------------\n");
printf("\nEnter your choice:");
scanf("%d", &c);
printf("\n");
switch (c)
{
case 1:
insert();
break;
case 2:
emp = empty();
if (emp == 0)
printf("\nThe file is EMPTY\n");
else
disp();
break;
case 3:
search();
break;
case 4:
deletefile();
break;
case 5:
update();
break;
case 6:
emp = empty();
if (emp == 0)
printf("\n The file is EMPTY\n");
else
sort();
break;
case 7:
exit(1);
break;
default:
printf("\nYour choice is wrong\nPlease try again...\n");
break;

}
} while (c != 7);
}



9 comments:

  1. can you help me how to change the Void Sort() from sorting the roll number to sorting names into ascending alphabetical order.. your help is the most important thing to me in my life right now.. thank you..

    ReplyDelete
  2. if i were to add three different marks for each name how would i find the average for each name?

    ReplyDelete
  3. I need some help with the kind of work you did

    ReplyDelete
  4. I have no idea what avlrollno is or what it does

    ReplyDelete
  5. Actually avlrollno is a user define function, it is define at the bottom

    ReplyDelete
  6. i can not save more then 100 records. So what is the problem. why i can't save 1000 redors ?

    ReplyDelete
  7. sir ,i have problem with text file. when i open record text file in notepad ..im getting names properly but rollno and marks are displaying in special characters. kindly reply me asap.

    ReplyDelete
  8. Whats the meaning behind FILE *fpt?

    ReplyDelete