Constractors

[iliya24]

Hello
i starting learning c++ i have some questions about constructors
for example: why i can declare classname tpm1;this will create an object with defult constractor ,or classname tmp1(10,8) this will also create an object whith thoose values ,but if i declare classname tmp1(); it dose not work ?!
Thx

[coder777]

because the compiler cannot decide whether classname tmp1(); is a function declaration (with the result classname) or a variable declaration

[iliya24]

thx