C Programming Day-12

How do you define a structure with a name student containing an int age?

• struct student { int age; };

• structure student { int age; };

• struct student = { int age; };

• student struct { int age; };

Answer explanation

This defines a structure named student with one member age of type int.
It groups related data (here, just age) under one name using the struct keyword.

Predict the output

• 3 4

• 4 3

• Compilation Error

• 0 0

Answer explanation

The structure is correctly initialized with x = 3 and y = 4.

Which keyword is used to define a structure in C?

• class

• struct

• object

• define

Answer explanation

In C, struct is the keyword used to create a user-defined data type that groups variables of different types.

What is the symbol used to declare a pointer?

• &

• %

• *

• @

Answer explanation

The asterisk ( * )i s used to declare and dereference a pointer.

What does the & operator do in C?

• Adds two numbers

• Finds modulus

• Multiplies pointers

• Finds address of a variable

Answer explanation

&x gives the memory address of x.

What is the output of the following code?

• Address of x

• 10

• Garbage

• Compilation error

Answer explanation

For example, &x gives the memory address of x.

How do you access the member age of a structure variable p?

• p->age

• p.age

• age.p

• p->age()

Structures help group ________ data types under one name

• same

• identical

• similar

• different

Answer explanation

Structures allow you to combine variables of different data types (like int, char, float) into a single unit.

Predict the output

• 6

• 5

• Error

• Address of x

Answer explanation

*p is x, and you're incrementing its value by 1.

What does NULL mean in C?

• An uninitialized pointer

• A memory address

• A value 0

• Undefined behavior

Answer explanation

NULL is defined as 0 in <stddef.h> and signifies a pointer pointing to nothing.