lab10i.c

ALL LINUX LAB PROGRAM MIT MANIPAL 2008-09 BATCH

#include<stdio.h>
#include<string.h>
struct student
{
	char roll[34];
	char n[30];
	char sem[20];
	char c[20];
	char mks[20];
}stu[20];
main()
{
	int i,n,fd,sw,pos;
	char fn[30],ch='y',rn[30],ni[]="\n";
	printf("\nEnter the File name\n");
	scanf("%s",fn);
	fd=creat(fn,0777);
	fd=open(fn,1);
	do
	{
	printf("\t\t.......MENU.......\n\n");
	printf("\t\t1.Insert\n");
	printf("\t\t2.delete\n");
	printf("\t\t3.Search\n");
	printf("\t\t4.Display\n");
	printf("\n\tEnter the Option...");
	scanf("%d",&sw);
	switch(sw)
	{
		case 1:
			printf("\nEnter the no of student\n");
		        scanf("%d",&n);
			printf("\nEnter the record \n");
			for(i=0;i<n;i++)
			{
				printf("\nRoll Number\n");
				scanf("%s",stu[i].roll);
				printf("\nName\n");
				scanf("%s",stu[i].n);
				printf("\nSemester\n");
				scanf("%s",stu[i].sem);
				printf("\nDepartment\n");
				scanf("%s",stu[i].c);
				printf("\nTotal Marks\n");
				scanf("%s",stu[i].mks);
				write(fd,&stu[i],sizeof(struct student));
				
			}
			close(fd);
			break;
		case 2:
			printf("\nEnter the Roll no....");
			scanf("%s",rn);
			fd=open(fn,1);
			for(i=0;i<n;i++)
			{
				while(read(fd,&stu[i],sizeof(struct student))!=0)
				if(strcmp(stu[i].roll,rn)==0)
				{
					pos=i;
				}
			}
			
			for(j=0;j<n;j++)
			{
				if(j!=pos)
				 printf("\n%s\t%s\t%s\t%s\t%s\n\n",stu[i].roll,stu[i].n,stu[i].sem,stu[i].c,stu[i].mks);
                                
                        }
			break;
		case 3:
			printf("\nEnter the Roll no....");
                        scanf("%s",rn);
                        for(i=0;i<n;i++)
                        {
                                if(stu[i].roll==rn)
                                {
					printf("\n\n%s\t%s\t%s\t%s\t%s\n\n",stu[i].roll,stu[i].n,stu[i].sem,stu[i].c,stu[i].mks);
				}
			}
			break;
		case 4:
			fd=open(fn,0);
			for(i=0;i<n;i++)
			{
				while(read(fd,&stu[i],sizeof(struct student))!=0)
				 printf("\n%s\t%s\t%s\t%s\t%s\n\n",stu[i].roll,stu[i].n,stu[i].sem,stu[i].c,stu[i].mks);
                                
                        }
                        break;
	
		default:
			printf("Worng choice....");
	}
	scanf("%c",&ch);
}while(ch!='y');
close(fd);
}