My first C++ Program

Homework 1.cpp

#include <iostream>  //input/output on stream
#include <iomanip>  //setw
using namespace std; //~~std::~~
void star(int, int);
int x, start = 1;
int main()
{
    int i=1,k=1,z;
    cout<<"Qing Shu Ru Yi Ge Shu Zi : "; //display message
    cin>>x;  //input message
    z=3*x-1; //lowend,*'s quantity
    star(start,x);//upper start 需要重置成 1
    //lowend
    for(i=1;i<=x;i++)
    {
        for(k=1;k<=x;k++)
        {
            cout<<" ";
        }
        for(k=1;k<=z;k++)
        {
            cout<<"*";
        }
        cout<<endl;
    }
    
}

void star(int sta,int final)//upper tran

{
    if(sta<=final)
    {
        for (int i=1;i<=sta;i++)
           cout<<setw(i);
        for (int i=1;i<=sta;i++)
            cout <<"*";
        for(int i=1;i<=sta;i++)
            cout<<setw((-4)*i+5*x+2);//The width of the crown head
        for (int i=1;i<=sta;i++)
            cout << "*";        
        cout << endl;     
        star(sta+1,final);
    }
}