C Programming
String concatenation means -

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

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

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

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