C Programming - Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to C Programming Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

cprogramming_questions_answers.htm

Q 1 - What is the output of the following code snippet?

#include<stdio.h>

main()
{ 
   int *p = 15; 
   printf("%d",*p);
}

Answer : C

Explanation

Runtime error, as the pointer variable is not holding proper address, writing/reading the data from the same raises runtime error.

Q 2 - The type name/reserved word ‘short’ is ___

Answer : D

Explanation

short is used as an alternative of short int.

Q 3 - What is the output of the following program?

#include<stdio.h>

main()
{	
   union abc {
      int x;
      char ch;
   }var;

   var.ch = 'A';
   printf("%d", var.x);
}

Answer : C

Explanation

65, as the union variables share common memory for all its elements, x gets ‘A’ whose ASCII value is 65 and is printed.

Q 4 - What is the output of the following program?

#include<stdio.h>

main()
{	
   int a[] = {10, 20, 30};
   
   printf("%d", *a+1);
}

Answer : C

Explanation

*a refers to 10 and adding a 1 to it gives 11.

Q 5 - Which of the following functions disconnects the stream from the file pointer.

A - fremove()

B - fclose()

C - remove()

D - file pointer to be set to NULL

Answer : B

Explanation

fclose(), it flushes the buffers associated with the stream and disconnects the stream with the file.

Q 6 - In C programming language, a function prototype is a declaration of the function that just specifies the function’s interface (function's name, argument types and return type) and extracts the body of the function. By defining the function, we get to know what action a particular function is going to perform.

A - True

B - False

Answer : A

Explanation

Explanation: The function body shall associate a specific task, hence representing the action.

Q 7 - What is a pointer?

A - A keyword used to create variables

B - A variable used to store address of an instruction

C - A variable used to store address of other variable

D - A variable used to store address of a structure

Answer : C

Explanation

If var is a variable then &var is an address in memory.

Q 8 - Which of the following statement can be used to free the allocated memory?

A - remove(var-name);

B - free(var-name);

C - vanish(var-name);

D - erase(var-name);

Answer : B

Explanation

The library function free() deallocates the memory allocated by calloc(), malloc(), or realloc().

Q 9 - An operation with only one operand is called unary operation.

A - Yes

B - An operation with two operand is called unary operation

C - An operation with unlimited operand is called unary operation

D - None of the above

Answer : A

Explanation

Unary operator acts on single expression.

Q 10 - The maximum combined length of the command-line arguments as well as the spaces between adjacent arguments is – a) 120 characters, b) 56 characters, c) Vary from one OS to another

Answer : D

Explanation

The maximum combined length of the command-line arguments and the spaces between adjacent arguments vary from one OS to another.