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#include <iostream>
 
 
int* alloc( int n )
{
    std::cout << "alloc size " << n << std::endl;
    return new int[n];
}
 
class A
{
    int n;
    int *a;
public:
    //A(int x): a(new int[n]), n(x) 
    A(int x): a( alloc(n) ), n(x) d
    {
        a[n-1] = 111;
    }
    void showSize()
    {
        std::cout << a[n - 1] << '\n';
    }
};
 
int main()
{
    A a(10);
    a.showSize();
}
 

prog.cpp: In constructor ‘A::A(int)’:
prog.cpp:13:10: warning: ‘A::a’ will be initialized after [-Wreorder]
prog.cpp:12:9: warning:   ‘int A::n’ [-Wreorder]
prog.cpp:16:5: warning:   when initialized here [-Wreorder]
prog.cpp:16:35: error: expected ‘{’ before ‘d’
prog.cpp: In function ‘int main()’:
prog.cpp:29:7: error: ‘class A’ has no member named ‘showSize’

Standard output is empty