[C++]打印三角形&棱形.

#include <iostream>
#include <locale>
using namespace std;
void daosj();
void main();

void main()
{
int i,j;
for(i=0;i<=29;i++)
{
for(j=1;j<=30-i;j++)
cout<<" ";
for(j=-1;j<=i*2-1;j++)
cout<<"*";
cout<<"\n";
}
daosj();
}

void daosj()
{
int i,j;
for (i=30;i>=0;i--)
{
for (j=0;j<30-i;j++)
cout<<" ";
for (j=-1;j<=i*2-1;j++)
cout<<"*";
cout<<"\n";
}
}