What are the differences between int main(), void main(), and main(), and why is a return statement necessary in main()?

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main() vs int main() vs void main() and why return statement is necessary in main()

main() is not a standard function signature and should be avoided
int main() returns an integer value to the operating system indicating the status of the program
void main() is not a standard function signature and should be avoided
return statement in main() is necessary to indicate the status of the program to the operating system