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Explain the Union to pointer in C language
A union is called as a memory location, which is shared by several variables of different data types.
Syntax
The syntax is as follows −
union uniontag{
datatype member 1;
datatype member 2;
----
----
datatype member n;
};For example,
union sample{
int a;
float b;
char c;
};Declaration of union variable
Given below are the respective declarations of union variable −
Union sample
{
int a;
float b;
char c;
}s;
Union
{
int a;
float b;
char c;
}s;Union sample
{
int a;
float b;
char c;
};
union sample s;When union is declared, the compiler automatically creates a variable which hold the largest variable type in the union.
At any time, only one variable can be referred.
Initialization and accessing
- Accessing union member is same as the structure.
- Generally, the dot operator is used for accessing members.
- The arrow operator ( ->) is used for accessing the members
- There is no restriction while using data type in a union.
Example
Following is the C program for union to pointer −
#include<stdio.h>
union abc{
int a;
char b;
};
int main(){
union abc var;
var.a=90;
union abc *p=&var;
printf("%d%c",p->a,p->b);
}Output
When the above program is executed, it produces the following result −
90Z
Updated on: 09-Mar-2021
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