C Programming – Features & The First C Program -- Which of the following is NOT a characteristic of C programming?

• Machine-independent
• High-level language
• Primarily object-oriented
• Structured programming language

Answer explanation

C is a procedural language and not primarily object-oriented, unlike C++ or Java.

C Programming – Features & The First C Program -- What is the main function of the preprocessor directive `#include <stdio.h>`?

• Links the standard input/output library
• Defines a new function
• Declares a global variable
• Includes user-defined headers

Answer explanation

It includes the standard input/output header file, providing access to functions like `printf` and `scanf`.

C Programming – Features & The First C Program -- What is the purpose of the `main()` function in a C program?

• It's an optional function
• It's the entry point of execution
• It declares global variables
• It handles error logging

Answer explanation

Program execution in C always begins from the `main()` function.

C Programming – Features & The First C Program -- Which of the following is the correct way to end a C statement?

• A colon (:)
• A semicolon (;)
• A period (.)
• A comma (,)

Answer explanation

Every statement in C must end with a semicolon.

C Programming – Features & The First C Program -- Which of the following is a key feature of C that allows direct memory manipulation?

• Garbage collection
• Pointers
• Virtual memory
• Polymorphism

Answer explanation

C's powerful pointer concept allows for direct memory access and manipulation.

Introduction to Variables -- What is a variable in C?

• A fixed value that cannot be changed
• A named storage location in memory
• A function that performs a specific task
• A predefined keyword in the language

Answer explanation

A variable is a symbolic name for a memory location used to store data.

Introduction to Variables -- Which of the following is a valid declaration of an integer variable in C?

• `int 1num;`
• `_int num;`
• `int num;`
• `integer num;`

Answer explanation

`int` is the correct keyword for an integer, and `num` is a valid identifier.

Introduction to Variables -- What is the initial value of a local variable if it's not explicitly initialized?

• Zero
• Garbage value
• Null
• 1

Answer explanation

Local variables that are not explicitly initialized contain garbage values.

Variable Naming Conventions -- Which of the following is NOT a valid C identifier?

• `my_variable`
• `_count`
• `2nd_try`
• `variableName`

Answer explanation

Identifiers in C cannot start with a digit.

Variable Naming Conventions -- Which character is commonly used to separate words in multi-word variable names in C (snake_case)?

• Hyphen (-)
• Space ( )
• Underscore (_)
• Dot (.)

Answer explanation

The underscore is widely used in C for readability in variable names following snake_case.