C Programming
String concatenation means -

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

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C Programming
What is function?

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

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