C Programming
What is function?

Function is the fundamental modular unit. A function is usually designed to perform a specific task.
Function is a block of code that performs a specific task. It has a name and it is reusable.
All of these
Function is a block of statements that perform some specific task.

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C Programming
String concatenation means -

Comparing the two strings to define the larger one.
Partitioning the string into two strings.
Merging two strings.
Extracting a substring out of a string.
Combining two strings.

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C Programming
What is the difference between a declaration and a definition of a variable?

Both can occur multiple times, but a definition must occur first.
Both can occur multiple times, but a declaration must occur first.
A declaration occurs once, but a definition may occur many times.
There is no difference between them.
A definition occurs once, but a declaration may occur many times.

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