Is there a default return value for C ++ functions?

Question

I am surprised that the file containing the following lines of code was successfully compiled, and the linker creates the executable. I thought that all functions except mainshould have a valid operator returnif the return type is not equal void.

int foo(){}
double bar(){}
int main(){}

What am I missing?

Answer 1

I thought that all functions except mainshould have a valid return statement if return type void.

Yes they should. You will get undefined behavior if they don't.

What am I missing?

, , ; .

, .

Answer 2

, , undefined. , , .

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