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Define Pre-processor,function,Compile time,Run time.

Preprocessor :
It is a program that process the source code before it passes through the compiler. In computer science, a preprocessor is a program that processes its input data to produce output that is used as input to another program and the output is said to be a preprocessed form of the input data. The output data is often used by some subsequent programs like compilers.

Function:
A function is a subroutine that may include one or more statements designed to perform specific tasks.For C programming functions are as building blocks. A function is a group of statements that together perform (সঞ্চালন)a task. Every C program has at least one function, which is main(),and all the most trivial(নগণ্য) programs can define additional functions.

Compile time:
Compile time refers to the event that occur during the compilation process.

Run time:
Run time refers to the event that occur while the program is actually executing.

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