STUCTURE AND UNION EXAMPLE C PROGRAM

#include<stdio.h>

#include<conio.h>

// Structure Definition

struct stud

{       

            int rno;

            char name[10];

            float m1,m2,m3;

};

struct stud s;//Structure Variable Declaration

//Union Definition

union result

{

            char grade;

            float percentage;

};

Union result r; //Union variable Declaration

void main()

{

            int choice;

            float per,temp,total;

            clrscr();

            printf("\nEnter your Roll No");

            scanf("%d",&s.rno);

            printf("\nEnter your Name");

            scanf("%s",&s.name);

            printf("\nEnter your mark1");

            scanf("%f",&s.m1);

            printf("\nEnter your mark2");

            scanf("%f",&s.m2);

            printf("\nEnter your mark3");

            scanf("%f",&s.m3);

            total=s.m1+s.m2+s.m3;

            temp=(float)(total/300);

            r.percentage=temp*100;

            per=r.percentage;

            printf("\nEnter your choice");

            printf("\n1.Percentage\n2.Grade");

            scanf("%d",&choice);

            printf("\nyour name is %s",s.name);

            printf("\nyour roll no is %d",s.rno);

            printf("\nyour total is%f",total);

switch(choice)

{

            case 1:             printf("\nyour percentage is %f",r.percentage);

                                    break;

            case 2:            if(per<=100 && per>=90)

                                    {r.grade='S';}

                                    else if(per<=90 && per>=80)

                                    {r.grade='A';}

                                    else if(per<=80 && per>=70)

                                    {r.grade='B';}

                                    else if(per<=70 && per>=60)

                                    {r.grade='C';}

                                    else if(per<=60 && per>=55)

                                    {r.grade='D';}

                                    else if(per<=55 && per>=50)

                                    {r.grade='E';}

                                    else

                                    {r.grade='U';}

                                    printf("\nYour grade is%c",r.grade);

                                    break;

}

getch();

}