Q37 Write a C program to declare, initialize an union, example of union.

Write a C program to declare, initialize an union, example of union. 

#include <stdio.h>
union pack{
char a;
int b;
double c;
};
int main()
{
    union pack p;
    printf("\nOccupied size by union pack: %d",
                sizeof(p));
    p.a='A';
    printf("\nValue of a:%c",p.a);
    p.b=10;
    printf("\nValue of b:%d",p.b);
    p.c=12345.6790;
    printf("\nValue of c:%f",p.c);
    p.a='A';
    p.b=10;
    p.c=12345.6790;
    printf("\nValue of a:%c, b:%d, c:%f",p.a,p.b,
          p.c);
    return 0;
}

Output

Occupied size by union pack: 8
Value of a:A
Value of b:10
Value of c:12345.679000
Value of a:■, b:-377957122, c:12345.679000