Learn and Master C Programming - Variable Scope

This video tutorial covers the concept of variable scope in C programming, focusing on the differences between local and global variables. It explains how local variables are confined to the block they are declared in, while global variables are accessible throughout the program. The tutorial provides practical examples to illustrate how variable scope affects program behavior, including scenarios where local and global variables share the same name. The importance of initializing variables is also discussed, along with the implications of variable scope on memory management.

What is the primary characteristic of a local variable in C?

• It is only visible within the block it is declared.

• It is accessible throughout the entire program.

• It is automatically initialized to zero.

• It can be accessed by multiple files.

What happens to a global variable if it is not initialized?

• It is automatically set to zero in some C compilers.

• It remains uninitialized and can cause undefined behavior.

• It is automatically set to one.

• It is automatically set to zero in all C compilers.

Can a local and a global variable have the same name in C?

• Yes, but the global variable will be hidden by the local one.

• Yes, but the local variable will be hidden by the global one.

• No, it will cause a compilation error.

• No, it will cause a runtime error.

In a nested block, which variable takes precedence if a local variable is declared with the same name as a global variable?

• Both variables are accessible without any conflict.

• The global variable always takes precedence.

• The local variable in the nested block takes precedence.

• The program will not compile due to the conflict.

What is the output when a local variable is modified within its block?

• The global variable is modified.

• The local variable outside the block is modified.

• Only the local variable within the block is modified.

• No variable is modified.

What happens to a local variable when the block it resides in is exited?

• It remains in memory for future use.

• It is destroyed and its memory is freed.

• It is saved for the next execution.

• It is converted to a global variable.

If a global variable and a local variable have the same name, which one is accessed outside the local block?

• Both variables are accessed simultaneously.

• The global variable is accessed.

• Neither variable is accessed.

• The local variable is accessed.