Programming in C MCQ - Structure and Union

1 In a C structure, what happens when the declaration unsigned int c : 5; is changed to unsigned int c : 6;?

In C, a bit-field is a structure or union member whose width is specified after a colon. Changing unsigned int c : 5; to unsigned int c : 6; increases the declared width of bit-field c from five bits to six bits. Its name and unsigned integer type remain unchanged. The maximum representable value increases from 31 to 63. Therefore, option C is correct.

2 What does the declaration int x : 4; specify when used inside a C structure or union?

In C, int x : 4; declares a bit-field named x with a width of four bits when used inside a structure or union. Bit-fields allow integer members to occupy a specified number of bits. Whether a plain int bit-field is signed or unsigned is implementation-defined. This declaration does not define an ordinary standalone integer variable, an array, or a pointer. Therefore, option C is correct.

3 Consider the declaration:
static struct
{ unsigned a:5;
unsigned b:5;
unsigned c:5;
unsigned d:5%:
}v=(1,2,3,4);
v occupies

4 A short integer occupies 2 bytes an, ordinary integer 4 bytes and a long integer occupies 8 bytes of memory
If a structure is defined as
struct TAB{
short a;
int b;
long c;
}TABLE[10];
the total memory requirement for TABLE is

5 The expression a<<6 shifts all bits of a six places to the left. If a 0x6db7, then what is the value of a<<6?

Programming in C MCQ - Structure and Union

Structures And Union Questions for UGC NET Computer Science

Structures And Union MCQ

Structures And Union Multiple choice questions

Accessibility