Why main function must return integer?

Answer 1

So that it indicates to the main function that the code ran without any error.
Generally​ return 0 is used.

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Answer 2

It's because you're probably using "int main()". You need to return a value if you're using int. If you use "void main()" you actually don't need to return anything at all! Hope it helps :D

Answer 3

it cause errors if i use "void main()", even if if i use "long int main()"