C++ 通过指针 object 将 arguments 传递给参数化构造函数时出现程序错误？

Question

I have a class called sample .

class sample
{
private:
    int Age;
public:
    sample() : Age() {}
    sample(int age)
    {
        this->Age = age;
    }
};

In main

int main()
{
    sample* s = new sample();
    s(21);

    return 0;
}

I want to pass values to the parameterized constructor through pointer object but it's giving this error

expression preceding parentheses of apparent call must have (pointer-to-) function type

Answer 1

You've already constructed the object when did new sample() , so you can pass your constructor values right there. You cannot construct the object twice.

Do it like this:

sample* s = new sample(21);

or

sample* s;
s = new sample(21);