Program:
#include<stdio.h>
struct student
{
char name[20];
int rn;
int tm;
}s1;
int a[25];
int no,i,j,k,l,p,q,s,t;
char c;
int f=0;
FILE *fp,*ft,*fr;
main()
{
int b;
while(1)
{
printf("\n1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :");
scanf("%d",&b);
switch(b)
{
case 1:create();
break;
case 2:list();
break;
case 3:delete();
break;
case 4:search();
break;
case 5:sort();
break;
case 6:marksort();
break;
default:
break;
}
}
}
/*Function to insert a record*/
create()
{
s=6;
fp=fopen("stn.dat","a+");
while(s==6)
{
fclose(fp);
search();
fp=fopen("stn.dat","a+");
if(f==0)
{
s1.rn=no;
printf("\nEnter student's name,mark:");
scanf("%s %d",s1.name,&s1.tm);
fwrite(&s1,sizeof(s1),1,fp);
}
printf("\n Enter 6 to create another:");
fflush(stdin);
scanf("%d",&s);
}
fclose(fp);
}
/*Function to display all records*/
list()
{
fp=fopen("stn.dat","r");
printf("\n NAME ROLLNO MARK :");
while(fread(&s1,sizeof(s1),1,fp)==1)
{
printf("\n%s\t%4d %4d\n",s1.name,s1.rn,s1.tm);
}fclose(fp);
}
/*Function to delete records*/
delete()
{
fp=fopen("stn.dat","r");
p=1;
while(p==1)
{
printf("\nEnter student's RollNo to delete:");
scanf("%d",&no);
ft=fopen("temp.dat","a+");
while(fread(&s1,sizeof(s1),1,fp)==1)
{
if (s1.rn != no)
fwrite(&s1,sizeof(s1),1,ft);
remove("stn.dat");
rename("temp.dat","stn.dat");
fp=fopen("stn.dat","r+");
printf("Enter 1 to delete another");
fflush(stdin);
scanf("%d",&p);
}
fclose(fp);
fclose(ft);
}
}
/*Function to search a record*/
search()
{
f=0;
fp=fopen("stn.dat","r");
printf("\nEnter RollNo:");
scanf("%d",&no);
while(fread(&s1,sizeof(s1),1,fp)==1)
{
if(s1.rn==no)
{
f=1;
break;
}
}
if (f==1)
{
printf("\nRECORD EXISTS DETAILS ARE :");
printf("%s %d %d\n",s1.name,s1.rn,s1.tm);
}
else
{
printf("\n RECORD NOT EXISTS\n");
fclose(fp);
}
}
/*Function to sort w.r.t RollNo*/
sort()
{
fp=fopen("stn.dat","r+");
fr=fopen("spp.dat","a+");
i=0;
while(fread(&s1,sizeof(s1),1,fp)==1)
{
a[i]=s1.rn;
i++;
}
l=i;
isort();
for(i=l-1;i>=0;i--)
{
rewind(fp);
while(fread(&s1,sizeof(s1),1,fp)==1)
if(a[i]==s1.rn)
fwrite(&s1,sizeof(s1),1,fr);
}
fclose(fp);
fclose(fr);
remove("stn.dat");
rename("spp.dat","stn.dat");
}
isort()
{
int t;
for(j=1;j<1;j++)
{
for(k=j;(k>0 || (a[k-1]< a[k]));k--)
{
if(a[k]<a[k-1])
{
t=a[k];
a[k]=a[k-1];
a[k-1]=t;
}
}
}
}
/*Function to sort w.r.t marks */
marksort()
{
int i;
fp=fopen("stn.dat","r+");
ft=fopen("smm.dat","w+");
i=0;
while(fread(&s1,sizeof(s1),1,fp)==1)
{
a[i]=s1.tm;
i++;
}
l=i;
isort();
for(i=l-1;i>=0;i--)
{
rewind(fp);
while(fread(&s1,sizeof(s1),1,fp)==1)
if(s1.tm==a[i])
fwrite(&s1,sizeof(s1),1,ft);
}
fclose(fp);
fclose(ft);
remove("stn.dat");
rename("smm.dat","stn.dat");
}
Output:
nn@linuxmint ~ $ gcc file.c
nn@linuxmint ~ $ ./a.out
1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :1
Enter RollNo:1
RECORD NOT EXISTS
Enter student's name,mark:Afsal 85
Enter 6 to create another:6
Enter RollNo:2
RECORD NOT EXISTS
Enter student's name,mark:Vipin 90
Enter 6 to create another:6
Enter RollNo:3
RECORD NOT EXISTS
Enter student's name,mark:Tinu 81
Enter 6 to create another:7
1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :2
NAME ROLLNO MARK :
Afsal 1 85
Vipin 2 90
Tinu 3 81
1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :6
1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :2
NAME ROLLNO MARK :
Vipin 2 90
Afsal 1 85
Tinu 3 81
1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :5
1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :2
NAME ROLLNO MARK :
Afsal 1 85
Vipin 2 90
Tinu 3 81
1:Create 2:List 3:Delete 4:Search 5:Sort w.r.t Roll# 6:Sort w.r.t Mark :4
Enter RollNo:2
RECORD EXISTS DETAILS ARE :Vipin 2 90
