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Structures, Unions, Enums - Programming

Q1:

What will be the output of the program ? 
#include<stdio.h>

int main()
{
    union var
    {
        int a, b;
    };
    union var v;
    v.a=10;
    v.b=20;
    printf("%d\n", v.a);
    return 0;
}

A 10

B 20

C 30

D 0

ANS:B - 20

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