C Programming Mastery Challenge

What is a pointer in C and how is it declared?

• A pointer in C is declared using the syntax 'type *pointerName;', for example, 'int *ptr;'

• A pointer in C is declared using 'type &pointerName;'.

• A pointer in C is declared with the syntax 'pointerName : type;'.

• A pointer in C is a variable that holds a string value.

Explain the difference between a pointer and a regular variable.

• A pointer holds a memory address, whereas a regular variable holds a value.

• A regular variable can hold a memory address.

• Pointers can only store integer values.

• A pointer is a type of regular variable.

How do you dynamically allocate memory in C?

• Use 'new' to allocate memory in C.

• Use 'malloc', 'calloc', or 'realloc' to dynamically allocate memory in C.

• Use 'free' to allocate memory in C.

• Use 'printf' to allocate memory in C.

What is the purpose of the 'free' function in C?

• To copy data from one memory location to another.

• The purpose of the 'free' function in C is to deallocate previously allocated memory.

• To initialize memory to zero.

• To allocate new memory for variables.

What is the output of the following code: int a = 5; int *p = &a; printf('%d', *p);?

• 5

• 4

• 6

• 10

What is the precedence of the arithmetic operators in C?

• Parentheses, Addition/Subtraction, Multiplication/Division/Modulus, Unary operators

• Unary operators, Addition/Subtraction, Parentheses, Division/Multiplication

• Parentheses, Unary operators, Multiplication/Division/Modulus, Addition/Subtraction

• Addition/Subtraction, Parentheses, Unary operators, Division/Modulus

How do you increment a pointer in C?

• ptr+=1

• ptr++

• ptr--

• ptr=ptr+1

What is the result of the expression 10 % 3 in C?

• 0

• 1

• 10

• 3

What is the purpose of the 'if' statement in C?

• To declare variables in C.

• To define a function in C.

• To execute code conditionally based on a boolean expression.

• To create loops in C.

How do you write a switch statement in C?

• switch(variable) { case value1: // code; break; case value2: // code; break; default: // code; }

• while(variable == value2) { // code; }

• if(variable == value1) { // code; }

• for(value in variable) { // code; }