C Program for operations of Sequential file with records


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C Program to do the operations of Sequential file with records. Sequential file, A file which consists of the same record types that is stored on a secondary storage device. The physical sequence of records may be based upon sorting values of one or more data items or fields. Here we are creating, Reading, searching the sequential file, using c file i/o operations.

C 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 (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;
}





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