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Why is it not necessary to include the return statement while using int main() in some compilers for C++? What about Turbo C++?
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The return value of main() function shows how the program exited. The normal exit of program is represented by zero return value. If the code has errors, fault etc., it will be terminated by non-zero value. In C++ language, the main() function can be left without return value.
In C++, int main() can be left without a return value at which point it defaults to returning 0.
2. int main() : It return some value like Zero or Non-Zero. The main function is C always return an integer value and it goes as an exit code to the program which executed it.
Yes. According to C standard, main() should return a int value.
In C++, and in C99 and C11, it is a special rule of the language that if the control flow reaches the end of the main function, then the function impliclty returns 0.
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In C++ and C99/C11, without a return statement in main function, it's default to return 0;
§ 3.6.1 Main function
A return statement in main has the effect of leaving the main function (destroying any objects with automatic storage duration) and calling std::exit with the return value as the argument. If control reaches the end of main without encountering a return statement, the effect is that of executing return 0;
also read wiki page C/C++ main function
In case a return value is not defined by the programmer, an implicit return 0; at the end of the main() function is inserted by the compiler; this behavior is required by the C++ standard.
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main must return an int, some compilers, including Turbo C++, may allow other return values, notably void main, but it's wrong, never use that.
However in C++, if you don't explicitly return a value in main, it's the same as return 0;
C++11 §3.6.1 Main function section 5
A return statement in main has the effect of leaving the main function (destroying any objects with automatic storage duration) and calling std::exit with the return value as the argument. If control reaches the end of main without encountering a return statement, the effect is that of executing
return 0;
Note that for C, this is only supported in C99 and later, but not supported by C89.
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