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# is a preprocessor directive. I think it helps the Linker to link the required libraries. It tells the preprocessing required to be done before compilation. It has other uses also as in
# define x 30 where x is replaced by 30 everywhere in the program. Hope this helps 😀
I dont agree with Apprentice.
Libraries are an important part of c programs and we need to include them to us e components insie them
for example in a c++ program,without #include<conio.h>
how can we use cin and cout?