why we are use in return 0 in the statement?

Answer 1

because a function must return a value
if u don't want to use return 0 statement then instead of declaring as "int main()" declare as "void main()"

Answer 2

because with main we use int (integer ) and it have a return value and we don't want to return any value from it. so we wright 0 with return(return 0;)

Answer 3

return 0 mean no value passing

Answer 4

return 0 is once execution over ...the value goes to the main function with 0 ....again execution and return back to 0