Podcast
Questions and Answers
What is a variable in C?
What is a variable in C?
- A substitute for the value it stores in C (correct)
- A constant value in C programs
- A memory address in C language
- A reserved keyword in C syntax
What happens during the variable initialization process in C?
What happens during the variable initialization process in C?
- Declaration of the variable
- Assignment of a meaningful value by the user (correct)
- Memory allocation by the compiler
- Assignment of a random garbage value
Which aspect of defining a variable in C involves allocating memory and assigning a random garbage value?
Which aspect of defining a variable in C involves allocating memory and assigning a random garbage value?
- Variable definition (correct)
- Variable declaration
- Variable reassignment
- Variable initialization
What does a variable's size in C depend on?
What does a variable's size in C depend on?
Which type of variable in C has a scope limited to the block or function in which it is declared?
Which type of variable in C has a scope limited to the block or function in which it is declared?
What keyword is used to define a static variable in C?
What keyword is used to define a static variable in C?
Which type of variable in C can retain its value for multiple function calls?
Which type of variable in C can retain its value for multiple function calls?
What is the default value of static variables in C?
What is the default value of static variables in C?
Which type of variable in C can be shared between multiple C files?
Which type of variable in C can be shared between multiple C files?
Register variables in C are stored in the CPU register instead of what usual storage location?
Register variables in C are stored in the CPU register instead of what usual storage location?
Study Notes
Variables in C
- A variable in C is a named storage location that holds a value.
Initialization Process
- During variable initialization, memory is allocated and a value is assigned to the variable.
Defining a Variable
- Defining a variable in C involves allocating memory and assigning a random garbage value.
Variable Size
- A variable's size in C depends on its data type.
Scope of Variables
- Automatic variables have a scope limited to the block or function in which they are declared.
Static Variables
- The keyword
staticis used to define a static variable in C. - Static variables can retain their value for multiple function calls.
- The default value of static variables in C is zero.
External Variables
- External variables in C can be shared between multiple C files.
Register Variables
- Register variables in C are stored in the CPU register instead of RAM.
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Description
Learn about variables in the C programming language, which are names associated with memory locations to store data of different types. Understand the different types of variables in C based on scope, storage class, lifetime, and the type of data they store.
