C语言 怎么做?

#include <iostream>
using namespace std;

int main()
{
int i,j,n;
char ch;
scanf("%d",&n);
for(i=1;i<n;i++)
{
for(j=1;j<n+1-i;j++)
cout<<" ";
for(ch='A';ch<'A'+2*i-1;ch++)
cout<<ch;
cout<<"\n";
}
return 0;
}