class MathDemo
{
//圆的面积
public void getCircleArea(double radius){
double PI=3.14;
System.out.println("圆的面积:"+PI*radius*radius);
}
//矩形
public void printRect(int width,int heigth){
for (int i=0;i<heigth ; i++)
{
for (int j=0;j<width ;j++ )
{
System.out.print("-");
}
System.out.println();
}
}
//最大数
public int getMax(int a,int b){
return a>b?a:b;
}
//是否是闰年
public void getYear(int year){
if((year%4==0 && year%100!=0) || year%400==0){
System.out.println(year+"是闰年。");
}else{
System.out.println(year+"不是是闰年。");
}
}}
public static void printRect(int width,int heigth){
for (int i=0;i<heigth ; i++){
for (int j=0;j<width ;j++ ){
if(i == 0 || i == heigth-1){
if(j == width-1){
System.out.println("-");
}else{
System.out.print("-");
}
}else{
if(j == 0 || j == width-1){
if(j == width-1){
System.out.println("|");;
}else{
System.out.print("|");
}
}else{
System.out.print(" ");
}
}
}
}
}