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#include <iostream>
using namespace std;
#include <iomanip>
#define SET if(i==wi){cout<<setw(i+1)<<'*'<<endl;}else{cout<<setw(i+1)<<'*'<<setw(2*(wi-i))<<right<<'*'<<endl;}
int main()
{
int wi;
cout << "输入菱形的边长" << endl;
cin >> wi;
for (int i = wi; i >=1; i--)SET
for (i = 0; i <= wi; i++)SET
return 0;
}
充分利用环境给定的输出格式函数setw和right，避免了过多的循环！
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