C Programming - Structures, Unions, Enums - Discussion
Discussion Forum : Structures, Unions, Enums - Find Output of Program (Q.No. 2)
2.
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;
}
Discussion:
83 comments Page 5 of 9.
Jyoti pandey said:
1 decade ago
Rajadurai is wrong.
Union not allocate for large memory size.
It allocate the last overrided value Whether it is large or small
Union not allocate for large memory size.
It allocate the last overrided value Whether it is large or small
Sushil chavan said:
1 decade ago
I agree with @Srividhya. Union can locate only one variable at a time. Hence it takes the last variable value which is define.
S Saha said:
4 years ago
Overlapping.
By definition of a union: you can't simultaneously use v.a and v.b because both fields share the same address.
By definition of a union: you can't simultaneously use v.a and v.b because both fields share the same address.
(2)
Abhay said:
1 decade ago
If in above question a is initiallised with 20 and b with 10 then
o/p becomes 10(the last updated value is 10)..... ..!!!!
o/p becomes 10(the last updated value is 10)..... ..!!!!
Sanju said:
9 years ago
Actually in unions. The size of union corresponds to the length of the longest member. Thank you.
Ankita gaba said:
1 decade ago
If in above question a is initiallised with 20 and b with 10 then what will be the o/p?
Ali said:
10 years ago
I couldn't get it. If it takes the last initialization that must be v.b but it is v.a.
Sandy said:
1 decade ago
What if the data types are different in union?
ex: union var{
int a;
double b;
}
ex: union var{
int a;
double b;
}
Vignesh said:
8 years ago
Thanks for all the explanation. Thanks for all your help, I understand it now.
Vandana said:
1 decade ago
At first union stores large value into memory, so we Will get 20 as output.
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