C Program to understand concept of Union

Union

A union is a user-defined data type available in C that allows all members to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time.

Example

Keyword used to define it is union.

Like here, the union variable Emp has used two datatypes char type and float type. And the members X and Y are stored in a same memory location with memory storage of 4 bytes. Here the size of the union variable is 4 because the size of the union variable will always be the size of its largest element(i.e; the size of float y which is 4 bytes).To understand this more we have, Basic Program to understand the Concept of Union:

#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

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