阶乘和

int a = 0, b = 1, d = 1, c = 6, e = 1;
         for( b = 1; b <= c; b ++)
         {
             do
             {
                 e = d * e;     d ++;
             }
             while( d <= b);
             a = a + e;
         }
         System.out.println ( a );