C Programming - Declarations and Initializations - Discussion
Discussion Forum : Declarations and Initializations - Find Output of Program (Q.No. 10)
10.
What is the output of the program?
#include<stdio.h>
int main()
{
union a
{
int i;
char ch[2];
};
union a u;
u.ch[0] = 3;
u.ch[1] = 2;
printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i);
return 0;
}
Answer: Option
Explanation:
printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); It prints the value of u.ch[0] = 3, u.ch[1] = 2 and it prints the value of u.i means the value of entire union size.
So the output is 3, 2, 515.
Discussion:
77 comments Page 7 of 8.
Jignesh said:
1 decade ago
How is it possible?
I is the variable and how 515 came?
I is the variable and how 515 came?
Sravan said:
1 decade ago
I can't able to get why 2+1 is added to 512. Can any one please explain briefly ?
Nutan said:
1 decade ago
u.ch[0] = 3;
u.ch[1] = 2;
The Above two statements is fine but when u try to access i value, how it becomes 515 sum of index.
u.ch[1] = 2;
The Above two statements is fine but when u try to access i value, how it becomes 515 sum of index.
Sushma said:
1 decade ago
First of all why should we consider 8 bits to calculate size of union. Why not 16 bits or something else then the answer will change ?
Deepak said:
1 decade ago
@Sahana
Its like multiplying contents inside memory location with index....like 512*1(see fig)...all other are zero......2*1 & 1*1
Its like multiplying contents inside memory location with index....like 512*1(see fig)...all other are zero......2*1 & 1*1
Sahana said:
1 decade ago
Upto 512 calculation I can understand. But what about adding 2+1 with 512. So that we get the ans as 515. Please explain this.
Radhika said:
1 decade ago
But why do u.i gives the size of union?
Moorthy said:
1 decade ago
Please explain this program fully.
Wikiok said:
1 decade ago
#include<stdio.h>
union
{
int a;
char c[2];
} myu;
int main()
{
printf("%d",sizeof(myu)); //Size of the union in memory. 4
return 0;
}
-----------------
sizeof(union) = sizeof( largest element )
union
{
int a;
char c[2];
} myu;
int main()
{
printf("%d",sizeof(myu)); //Size of the union in memory. 4
return 0;
}
-----------------
sizeof(union) = sizeof( largest element )
Anu said:
1 decade ago
Please could anyone explain me this one I cant get it how. I gives this value?and how to calculate the size of union?
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