Why do we need to write "return 0" when code runs even without writing "return 0" ?

Answer 1

we use return in int main for exit status of program. return 0 means exit staus is zero ie our programs run successfully​ without error.

Answer 2

in what sense ? @dghi dghi

Answer 3

its simple answer is if you use int as function return type then it should have to return a value whether it is 0 also if you dont want this simply use void.