Which of the following function declaration is illegal? WHY ???
Which of the following function declaration is illegal? WHY ???
a)
double func();
int main(){}
double func(){}
b)
double func(){};
int main(){}
c)
int main()
{
double func();
}
double func(){//statements}
d) None of the mentioned
a)
double func();
int main(){}
double func(){}
b)
double func(){};
int main(){}
c)
int main()
{
double func();
}
double func(){//statements}
d) None of the mentioned
the compiler will tell you, if you really do not know. Set up a little test program, and see which one breaks it.
@Ganado, darn those comments!
a & b are also illegal, the custom function violates the return contract. :)
a & b are also illegal, the custom function violates the return contract. :)
If an ill-formed function exists, but no one is around to call it, is it still undefined behavior?
Edit: Apparently the answer my half-facetious question is 'no', it's only undefined behavior if control flow reaches the illegal point.
n4659 9.6.3
Edit: Apparently the answer my half-facetious question is 'no', it's only undefined behavior if control flow reaches the illegal point.
n4659 9.6.3
| Flowing off the end of a constructor, a destructor, or a function with a cv void return type is equivalent to a return with no operand. Otherwise, flowing off the end of a function other than main (6.6.1) results in undefined behavior. |
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