Hello World issue

#1

#include
Sometimes the code does not run if we don’t put this line after
#include

#2

Hey saurabh,
#include is a c++ preprocessor that does some pre-processing before actually compiling the program. some major library functions and other useful codes are added by this. if you want to read more about #include and other preprocessors you can visit - https://www.geeksforgeeks.org/cc-preprocessors/

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