C-Quest

What is the purpose of the 'sizeof( )' operator in C programming?

• To return the size of a variable

• To compare two strings

• To calculate the sum of two numbers

• To print the address of a variable

Mention the syntax for declaring a pointer in C.

• int ptr;

• int *ptr;

• *int ptr;

• ptr int;

What is the purpose of the 'continue' statement in C programming?

• To skip the current iteration and move to the next

• To print a line break in the output

• To exit the loop or switch statement

• To terminate the program

Mention the difference between '++i' and 'i++' in C programming.

• '++i' is post-increment and 'i++' is pre-increment.

• '++i' is pre-increment and 'i++' is post-increment.

• Both '++i' and 'i++' are used for the same purpose.

Give the output of the given code.

• -10, 0

• -9, -9

• -7, 0

• -10, -9

Answer explanation

In the context of the C programming language, ~a and !a have different meanings:

1. `~a` (Bitwise NOT):

- The `~` (tilde) operator in C performs bitwise NOT operation.

- It inverts each bit of the operand `a`.

- Example:

int a = 5; // binary: 0000 0101

int result = ~a; // binary: 1111 1010

2. `!a` (Logical NOT):

- The `!` (exclamation mark) operator in C is the logical NOT operator.

- It is used to invert the truth value of a condition or expression.

- If `a` is zero (false), then `!a` will be 1 (true), and if `a` is non-zero (true), then `!a` will be 0 (false).

- Example:

int a = 0;

int result = !a; // result will be 1 (true)

Explain the concept of 'Pointers' in C programming.

• Pointers are used to perform arithmetic operations.

• Pointers are used to store the value of other variables.

• Pointers are used to store the address of other variables.

Choose the correct option for receiving an input in Line 7.

Store the Input in variable "a".

• scanf("%d", *a);

• scanf("%d", x);

• scanf("%d", &x);

• scanf("%d", *x);

Answer explanation

In scanf we mention the address of the variable, where the value will be stored:

Syntax: scanf("%format_specifier", variable_address);

In this context,

x is a pointer storing the address of the variable a, where the input will be stored.

What is the purpose of the 'void' keyword in C programming?

• To declare a function that returns no value

• To declare a function that returns a character

• To declare a function that returns a pointer

• To declare a function that returns an integer

Choose the correct Syntax of the prototype:

For a Sum Function taking two Integer arguments "a" & "b".

• Sum (a ,b);

• int Sum(int a)(int b);

• void Sum (int a+ int b);

• int Sum (int a , int b);

What will be the output of the following code?

• 18

• 17

• 10

• 15

Answer explanation

In this question,

' i ' runs 10-times, of which there are 5 even values (0,2,4,6,8) and 5 odd values (1,3,5,7,9).

As per the conditional statement:

• - For every even value 'for(i%2==0)', the value of j is incremented by 2. Therefore the value of j becomes 12 because the initial value of j=2.

• - For every non-even value 'else', the value of p is incremented by 1. Therefore the value of p becomes 6 because the initial value of p=1.