Functions Questions and Answers

Q: What is the output of this C code? void main() { m(); m(); } void m() { static int x = 5; x++; printf("%d", x); }

Correct answer: 6 7A static local is initialised once, before the program starts, and keeps its value between calls - its storage lasts as long as the program even though its name is local. So the first call prints 6 and the second 7. An ordinary local would print 6 both times.

Q: What is the output of this C code? void main() { static int x; printf("x is %d", x); }

Correct answer: 0A static variable, whether at file scope or inside a function, is zero-initialised if given no initialiser. So it prints 0 - unlike an ordinary automatic variable, which would hold junk.

Q: What is the output of this C code? static int x; void main() { int x; printf("x is %d", x); }

Correct answer: Junk valueThe local int x; shadows the file-scope static, and being an automatic variable with no initialiser it holds whatever was on the stack - a junk value. Only variables with static storage duration are zeroed for you.

Q: Which of the following cannot be static in C?

Correct answer: None of the mentionedVariables and functions can both be static, which gives them internal linkage or, for a local variable, a lifetime as long as the program’s. A structure variable can be static too. What cannot be static is a structure type - but a type has no storage class in the first place.

Q: The scope of an automatic variable is:

Correct answer: Both (a) and (b)An automatic variable is visible from its declaration to the end of the block that contains it, and that includes any blocks nested inside - unless one of them declares another variable of the same name, which shadows it.

Q: Automatic variables are allocated space in the form of a:

Correct answer: stackAutomatic variables are allocated on the stack: space is reserved when the block is entered and released when it is left, which is what makes their lifetime match the block and what makes recursion possible - each call gets its own frame.

Q: Which of the following is a storage specifier?

Correct answer: autoThe storage class specifiers are auto, register, static, extern and typedef. enum and union introduce types, and volatile is a type qualifier, not a storage class.

Q: If no storage class is specified for a local variable, the default is auto.

Correct answer: trueA variable declared inside a block with no storage class is auto - on the stack, uninitialised, and gone when the block ends. The keyword is almost never written, precisely because it is the default.

Q: Automatic variables are stored in:

Correct answer: stackAutomatic variables are allocated on the stack: space is reserved when the block is entered and released when it is left, which is what makes their lifetime match the block and what makes recursion possible - each call gets its own frame.

91.

What is the output of this C code?

void main()
    {
        m();
        m();
    }
    void m()
    {
        static int x = 5;
        x++;
        printf("%d", x);
    }

A.6 7
B.6 6
C.5 5
D.5 6

Answer: A

Correct answer: 6 7

A static local is initialised once, before the program starts, and keeps its value between calls - its storage lasts as long as the program even though its name is local. So the first call prints 6 and the second 7. An ordinary local would print 6 both times.

Discuss in Forum

92.

What is the output of this C code?

void main()
    {
        static int x;
        printf("x is %d", x);
    }

A.1
B.Junk value
C.Run time error
D.0

Answer: D

Correct answer: 0

A static variable, whether at file scope or inside a function, is zero-initialised if given no initialiser. So it prints 0 - unlike an ordinary automatic variable, which would hold junk.

Discuss in Forum

93.

What is the output of this C code?

static int x;
    void main()
    {
        int x;
        printf("x is %d", x);
    }

A.Junk value
B.Run time error
C.Nothing

Answer: A

Correct answer: Junk value

The local int x; shadows the file-scope static, and being an automatic variable with no initialiser it holds whatever was on the stack - a junk value. Only variables with static storage duration are zeroed for you.

Discuss in Forum

94.

Which of the following is not accepted in C?

A.static a = 10; //static as
B.static int func (int); //parameter as static
C.static static int a; //a static variable prefixed with static
D.All of the mentioned

Answer: C

Correct answer: static static int a; //a static variable prefixed with static

A storage class specifier may appear only once in a declaration, so static static is rejected. The other two are legal: static a = 10; relies on the old implicit int, and static int func(int); declares a function with internal linkage.

Discuss in Forum

95.

Which of the following cannot be static in C?

A.Variables
B.Functions
C.Structures
D.None of the mentioned

Answer: D

Correct answer: None of the mentioned

Variables and functions can both be static, which gives them internal linkage or, for a local variable, a lifetime as long as the program’s. A structure variable can be static too. What cannot be static is a structure type - but a type has no storage class in the first place.

Discuss in Forum

96.

The scope of an automatic variable is:

A.Within the block it appears
B.Within the blocks of the block it appears
C.Until the end of program
D.Both (a) and (b)

Answer: D

Correct answer: Both (a) and (b)

An automatic variable is visible from its declaration to the end of the block that contains it, and that includes any blocks nested inside - unless one of them declares another variable of the same name, which shadows it.

Discuss in Forum

97.

Automatic variables are allocated space in the form of a:

A.stack
B.queue
C.priority queue
D.random

Answer: A

Correct answer: stack

Automatic variables are allocated on the stack: space is reserved when the block is entered and released when it is left, which is what makes their lifetime match the block and what makes recursion possible - each call gets its own frame.

Discuss in Forum

98.

Which of the following is a storage specifier?

A.enum
B.union
C.auto
D.volatile

Answer: C

Correct answer: auto

The storage class specifiers are auto, register, static, extern and typedef. enum and union introduce types, and volatile is a type qualifier, not a storage class.

Discuss in Forum

99.

If no storage class is specified for a local variable, the default is auto.

A.true
B.false
C.Depends on the standard
D.None of the mentioned

Answer: A

Correct answer: true

A variable declared inside a block with no storage class is auto - on the stack, uninitialised, and gone when the block ends. The keyword is almost never written, precisely because it is the default.

Discuss in Forum

100.

Automatic variables are stored in:

A.stack
B.data segment
C.register
D.heap

Answer: A

Correct answer: stack

Discuss in Forum

Loading…

Topics

Other Subjects

Tags: Functions Questions and Answers || Functions MCQ Questions and Answers || Functions GK Questions and Answers || Functions GK MCQ Questions || Functions Multiple Choice Questions and Answers || Functions GK || GK on Functions || C Programming Questions and Answers || C Programming MCQ Questions and Answers || C Programming GK Questions and Answers || GK on C Programming

Functions Questions and Answers

Topics

Other Subjects

About Us

Stay informed about all important Dates & Notifications