C Programming
The library function used to find the last occurrence of a character in a string is

strnstr()
laststr()
None of these
strstr()
strrchr()

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

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