about main function

Question

can someone describe me about main() function and why it return 0. please describe it detailly,

Answer 1

execution of a program starts from main function
C++ main function has to return a value because it is declared as "int main" which is given as return 0 some compilers support "void main" then there is no need of return..

Answer 2

main() function returns an integer value to allow the test of the execution. In case of error the program must return a error code (!=0) otherwise returns 0.