C program to insert Student Records to a Sequential File

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#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 (usn,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 USN 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;
}

#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 (usn,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 USN 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; }