Program To Input The Records Of N Students And Display Rankwise.

#include "stdio.h"
#include "conio.h"
#include "string.h"
#include "alloc.h"
#include "math.h"

struct grade
{
float subject[5];
float total;
};

struct students
{
char name[30];
int roll_no;
struct grade marks;
};

void read_data (struct students *);
void print_data (struct students s[]);
void sort_list (struct students s[]);
void swap (struct students * , struct students *);

int i,j,N; /* Global declaration for Index i and j and
N: Total number of students */

void main()
{
/* double d=sin(0.0); if the program generates error like "floating point format not linked"
include the above given statement */
clrscr();
struct students *s;
printf("How many students are there? ");
scanf("%d",&N);
s=(struct students *) malloc(N*sizeof(struct students));
printf("\n*******ENTER DATA*******");

for(i=0;imarks.total=0.0;

printf("\nName: ");
scanf("%[^\n]",s->name);
printf("Roll No: ");
scanf("%d",&s->roll_no);
printf("\nEnter The Marks Of Following Subjects.\n\n");
for(i=0;i<5;i++) { printf("Subject %d: ",i+1); scanf("%f",&s->marks.subject[i]);
s->marks.total+=s->marks.subject[i];
}
}

/* Sorting the list in Descending order */

void sort_list(struct students a[])
{
for(i=0;ii;j--)
if((a+j)->marks.total>(a+j-1)->marks.total)
swap(a+j,a+j-1);
}

/* This function Swaps the contents of s1 and s2 i.e,
- Total Marks
- Mark of Individual Subjects
- Roll Number and
- Name
*/


void swap(struct students *s1,struct students *s2)
{
int temp;
char string[30];

temp=s1->marks.total;
s1->marks.total=s2->marks.total;
s2->marks.total=temp;

for(i=0;i<5;i++) { temp=s1->marks.subject[i];
s1->marks.subject[i]=s2->marks.subject[i];
s2->marks.subject[i]=temp;
}

temp=s1->roll_no;
s1->roll_no=s2->roll_no;
s2->roll_no=temp;

strcpy(string,s1->name);
strcpy(s1->name,s2->name);
strcpy(s2->name,string);

}

/* Printing Data */

void print_data(struct students a[])
{
printf("Record Of The Students Rankwise.");
for(i=0;iname);
printf("\nRoll No: %d\n",(a+i)->roll_no);
printf("\n--------------------------------MARKS-------------------------------------\n");
printf(" Math C-Programming Com.Concept Physics English Total\n");
for(i=0;i<5;i++) printf("%-12.2f ",(a+i)->marks.subject[i]);
printf("%-12.2f",(a+i)->marks.total);
getch();
}
}

/* END OF PROGRAM */