Java入门——第十天

class TriangleDemo{
    public static void ninexjiu(){
          int line=9;
          int row=1;
while(row<=9){
          int col=9;
while(col >=row){
        System.out.print(col+"*" +row+"="+ (col *row)+"\t");
            col--;
         }
     row++;
       System.out.println();
}
    }    
public static void main(String[] args){
        //TriangleDemo  t=new TriangleDemo();
   //  t.ninexNine();
    //    t.sum();
        ninexjiu();
    }
}

    public static   void ninexnine(int a){
        for(int x1=0;x1<=a;x1++){
            for(int y1=0;y1<=x1;y1++){
                System.out.print(x1+"*"+y1+ "=" +(x1*y1)+"\t");
            }
            System.out.println();
        }
    }
    public static void main(String[] args){
        //TriangleDemo  t=new TriangleDemo();
       ninexnine(5);
    }
}

public static int sum(int n){
        int sum=0;
        for(int i=0;i<=100;i++){
            sum=sum+i;
        }
        return sum;
    //    System.out.println("sum="+sum);
    }
    public static void main(String[] args){
        //TriangleDemo  t=new TriangleDemo();
        System.out.println("sum="+sum(10));
    }

}