p1 by ma'am

// 1.Write a program to calculate student result for three subjects for float three subject for four students. Find student having highest score in each subject, also student who is first in class.

#include <stdio.h>
#include <conio.h>
void clas(float);
struct stud
{
    int rno;
    int sub[3];
    int tot;
    float per;
};
void main()
{
    int i, j;
    int r, s1, s2, s3, t, x;
    char a[20];
    struct stud s[3];
    clrscr();
    // Scanning The Students Detail;
    for (i = 0; i < 3; i++)
    {
        s[i].tot = 0;
        s[i].per = 0;
        printf("\nRoll No:- ");
        scanf("%d", &s[i].rno);
        for (j = 0; j < 3; j++)
        {
            printf(" Enter Mark of Sub %d:- ", j + 1);
            scanf("%d", &s[i].sub[j]);
            s[i].tot = s[i].tot + s[i].sub[j];
            s[i].per = (s[i].tot / 3);
        }
    }

    // Sorting In Descending Order;

    for (i = 0; i < 3; i++)
    {
        for (j = i + 1; j < 3; j++)
        {
            if (s[i].tot < s[j].tot)
            {
                r = s[i].rno;
                s1 = s[i].sub[0];
                s2 = s[i].sub[1];
                s3 = s[i].sub[2];
                t = s[i].tot;
                x = s[i].per;

                s[i].rno = s[j].rno;
                s[i].sub[0] = s[j].sub[0];
                s[i].sub[1] = s[j].sub[1];
                s[i].sub[2] = s[j].sub[2];
                s[i].tot = s[j].tot;
                s[i].per = s[j].per;

                s[j].rno = r;
                s[j].sub[0] = s1;
                s[j].sub[1] = s2;
                s[j].sub[2] = s3;
                s[j].tot = t;
                s[j].per = x;
            }
        }
    }
    // Print The Result;
    clrscr();
    printf("\t\twww.Engiguide.com\n");

    for (i = 0; i < 3; i++)
    {
        printf("-------------------------------------------------------------------------------");
        printf("\nRank   Roll no   Sub 1   Sub 2   Sub 3   Total   Percentage   class");
        printf("\n----------------------------------------------------------------------------");

        for (i = 0; i < 3; i++)
        {
            printf("\n%2d       %2d       %2d      %2d      %2d      %3d        %.2f%                                                                                        ",i+1,s[i].rno,s[i].sub[0],s[i].sub[1],s[i].sub[2],s[i].tot,s[i].per);
		    clas(s[i].per);
        }
        printf("\n--------------------------------------------------------------------------------");
    }
    getch();
}

//  function Body To Check Class

void clas(float p)
{
    if (p >= 60 && p < 70)
        printf("First Class");

    else if (p >= 70)
        printf("Distinction");

    else if (p >= 40 && p < 48)
        printf("Pass Class");

    else if (p >= 48 && p < 60)
        printf("Second class");

    else if (p < 40)
        printf("Fail");
}

/*
OUTPUT

      Roll No:- 1
 Enter Mark of Sub 1:- 78
 Enter Mark of Sub 2:- 87
 Enter Mark of Sub 3:- 56

Roll No:- 2
 Enter Mark of Sub 1:- 45
 Enter Mark of Sub 2:- 89
 Enter Mark of Sub 3:- 65

Roll No:- 3
 Enter Mark of Sub 1:-78
 Enter Mark of Sub 2:-45
     Enter Mark of Sub 3:-69


           www.engiguide.com
------------------------------------------------------------------------------------------
Rank   Roll no   Sub 1   Sub 2   Sub 3   Total   Percentage   Class
------------------------------------------------------------------------------------------

2            2    45        89        65        199         66.00%      First Class
1            1    78        87        56        221         73.00%      Distinction
3            3    78        45        69        192         64.00%      First Class
-------------------------------------------------------------------------------------------
*/