C Programming - Structures, Unions, Enums - Discussion

Discussion Forum : Structures, Unions, Enums - Find Output of Program (Q.No. 10)

Structures, Unions, Enums

10.

What will be the output of the program ?

#include<stdio.h>

int main()
{
    struct byte
    {
        int one:1;
    };
    struct byte var = {1};
    printf("%d\n", var.one);
    return 0;
}

-1

Error

Answer: Option

Explanation:

No answer description is available. Let's discuss.

Discussion:

29 comments Page 3 of 3.

Prashant o_O said: 1 decade ago

int a;
a=1; means 0000000000000001

and

int a:1;
a=1; means 1000000000000001

Janu said: 1 decade ago

Hi friends
lets we take 1 in 1-bit field:0001
so the left most bit is '1'
which indicates -ve value
so the ans is -1

Parimal said: 1 decade ago

Thanks sundar.

Ganesh said: 1 decade ago

Thanks sundar

Deepa said: 1 decade ago

Thanks sundar.

Sundar said: 1 decade ago

Hi Viewers,

If you store 1 in 1-bit field:

The left most bit is 1, so the system will treat the value as negative number.

The 2's complement method is used by the system to handle the negative values.

Therefore, the data stored is 1. The 2's complement of 1 is also 1 (negative).

Therefore -1 is printed.

Please read the solution given for an another problem, you will understand it better:

http://www.indiabix.com/c-programming/structures-unions-enums/discussion-372

Prasanna said: 1 decade ago

Can you explain clearly?

Uma said: 1 decade ago

Can any one explain this concept briefly?

Rajadurai said: 2 decades ago

Hi Priyanka, one bit is allocated for variable one. so it must took left most sign bit. so the ans is -1.

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