AIM
To write a
C program to implement sequential access of file
ALGORITHM
Step-1: Start the program
Step-2: Open the student file in writing mode
Step-3: Get the user id, name and marks of the students
Step-4: Close the file and open the file in read mode
Step-5: For the search option, user id is given. If the record is found the
details of the
Student of the student is displayed
else failure will be displayed.
Step-6: The display option gives the entire details of the student
Step-7: End the program in the main
function
PROGRAM
#include <stdio.h>
typedef struct
{
int usn;
char name[25];
int m1,m2,m3;
}STD;
STD s;
void display(FILE *);
int search(FILE *,int);
void main()
{
int i,n,usn_key,opn;
FILE *fp;
printf(" How
many Records ? ");
scanf("%d",&n);
fp=fopen("stud.dat","w");
for(i=0;i<n;i++)
{
printf("Read
the Info for Student: %d (uid,name,m1,m2,m3) \n",i+1);
scanf("%d%s%d%d%d",&s.usn,s.name,&s.m1,&s.m2,&s.m3);
fwrite(&s,sizeof(s),1,fp);
}
fclose(fp);
fp=fopen("stud.dat","r");
do
{
printf("Press
1- Display\t 2- Search\t 3- Exit\t Your Option?");
scanf("%d",&opn);
switch(opn)
{
case 1: printf("\n
Student Records in the File \n");
display(fp);
break;
case 2:
printf(" Read the uid of the student to be searched ?");
scanf("%d",&usn_key);
if(search(fp,usn_key))
{
printf("Success ! Record found in the file\n");
printf("%d\t%s\t%d\t%d\t%d\n",s.usn,s.name,s.m1,s.m2,s.m3);
}
else
printf("
Failure!! Record with USN %d not found\n",usn_key);
break;
case 3: printf(" Exit!! Press a key . .
.");
getch();
break;
default: printf(" Invalid Option!!! Try again
!!!\n");
break;
}
}while(opn != 3);
fclose(fp);
} /* End of main()
*/
void display(FILE *fp)
{
rewind(fp);
while(fread(&s,sizeof(s),1,fp))
printf("%d\t%s\t%d\t%d\t%d\n",s.usn,s.name,s.m1,s.m2,s.m3);
}
int search(FILE *fp, int usn_key)
{
rewind(fp);
while(fread(&s,sizeof(s),1,fp))
if( s.usn ==
usn_key) return 1;
return 0;
}
