Sample C Program To Illustrate The Concept Of Unions.

# include <stdio.h>

void main()
{

    union number
   {
        int  n1;
        float n2;
    };
    union number x;

    printf("Enter the value of n1: ");
    scanf("%d", &x.n1);

    printf("Value of n1 = %d", x.n1);
    printf("\nEnter the value of n2: ");

    scanf("%f", &x.n2);
    printf("Value of n2 = %f\n", x.n2);
}

OUTPUT:

Enter the value of n1: 10
Value of n1 = 10
Enter the value of n2: 50
Value of n2 = 50.000000



Sample C Program To Find The Size Of A Union.


# include <stdio.h>

void main()
{

    union sample
   {
        int   m;
        float n;
        char  ch;
    };
    union sample u;
    printf("The size of union = %d\n", sizeof(u));
    /*  initialization */
    u.m = 25;
    printf("%d %f %c\n", u.m, u.n, u.ch);
    u.n = 0.2;
    printf("%d %f %c\n", u.m, u.n, u.ch);
    u.ch = 'p';
    printf("%d %f %c\n", u.m, u.n, u.ch);
}


OUTPUT:

The size of union = 4
25 0.000000
1045220557 0.200000
1045220464 0.199999