Computer StudyMCQ Computer ScienceQuiz Computer ScienceUGC NETUncategorized

C Programming Questions and Answers – Variable Length Argument

C Programming Questions and Answers – Variable Length Argument

 

1.What is the output of this C code?

#include <stdio.h>

#include <stdarg.h>

void func(int, …);

int main()

{

func(2, 3, 5, 7, 11, 13);

return 0;

}

void func(int n, …)

{

int number, i = 0;

va_list start;

va_start(start, n);

while (i != 3)

{

number = va_arg(start, int);

i++;

}

printf(“%d”, number);

}

a) 3

b) 5

c) 7

d) 11

View Answer

Answer:c

2.Which of the following function with ellipsis are illegal?

a) void func(…);

b) void func(int, …);

c) void func(int, int, …);

d) Both (a) and (c)

View Answer

Answer:a

3.Which of the following data-types are promoted when used as a parameter for an ellipsis?

a) char

b) short

c) int

d) None of the mentioned

View Answer

Answer:a

4.Which header file includes a function for variable number of arguments?

a) stdlib.h

b) stdarg.h

c) ctype.h

d) Both (a) and (b)

View Answer

Answer:b 

5.Which of the following macro extracts an argument from the variable argument list (ie ellipsis) and advance the pointer to the next argument?

a) va_list

b) va_arg

c) va_end

d) va_start

View Answer

Answer:b 

6.The type va_list is used in an argument list

a) To declare a variable that will refer to each argument in turn;

b) For cleanup

c) To create a list

d) There is no such type

View Answer

Answer:a

7.The declaration … can

a) Appear anywhere in the function declaration

b) Only appear at the end of an argument list.

c) Nothing

d) Both a & b

View Answer

Answer:b

8.Each call of va_arg

a) returns one argument

b) Steps va_list variable to the next

c) Both a & b

d) None of the mentioned

View Answer

Answer:c

9.The standard header _______ is used for variable list arguments (…) in C.

a) <stdio.h >

b) <stdlib.h>

c) <math.h>

d) <stdarg.h>

View Answer

Answer:d

10.va_end does whatever.

a) Cleanup is necessary

b) Bust be called before the program returns.

c) Both a &

d) None of the mentioned

View Answer

Answer:c 

11.What is the output of this C code?

#include <stdio.h>

int f(char chr, …);

int main()

{

char c = 97;

f(c);

return 0;

}

int f(char c, …)

{

printf(“%c\n”, c);

}

a) Compile time error

b) Undefined behaviour

c) 97

d) a

View Answer

Answer:a 

12.What is the output of this C code?

#include <stdio.h>

#include <stdarg.h>

int f(…);

int main()

{

char c = 97;

f(c);

return 0;

}

int f(…)

{

va_list li;

char c = va_arg(li, char);

printf(“%c\n”, c);

}

a) Compile time error

b) Undefined behaviour

c) 97

d) a

View Answer

Answer:a

13.What is the output of this C code?

#include <stdio.h>

#include <stdarg.h>

int f(char c, …);

int main()

{

char c = 97, d = 98;

f(c, d);

return 0;

}

int f(char c, …)

{

va_list li;

va_start(li, c);

char d = va_arg(li, char);

printf(“%c\n”, d);

va_end(li);

}

a) Compile time error

b) Undefined behaviour

c) a

d) b

View Answer

Answer:b

14.What is the output of this C code?

#include <stdio.h>

#include <stdarg.h>

int f(char c, …);

int main()

{

char c = 97, d = 98;

f(c, d);

return 0;

}

int f(char c, …)

{

va_list li;

va_start(li, c);

char d = va_arg(li, int);

printf(“%c\n”, d);

va_end(li);

}

a) Compile time error

b) Undefined behaviour

c) a

d) b

View Answer

Answer:d 

15.What is the output of this C code?

#include <stdio.h>

#include <stdarg.h>

int f(int c, …);

int main()

{

int c = 97;

float d = 98;

f(c, d);

return 0;

}

int f(int c, …)

{

va_list li;

va_start(li, c);

float d = va_arg(li, float);

printf(“%f\n”, d);

va_end(li);

}

a) Compile time error

b) Undefined behaviour

c) 97.000000

d) 98.000000

View Answer

Answer:b

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button