面向对象第二次作业

public class Friday1 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int yuan=5;
		double S=(yuan*yuan)*3.14;
		System.out.println("圆的面积为"+S);
		
		

	}

}

　　

public class Thursday2 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		System.out.println("输入华氏度"+50);
		int hua=50;
		double a= (hua-32)*5/9.0;
		System.out.println("摄氏度为"+a);
		System.out.println("输入摄氏度"+30);
		int she=30;
		double b=(she*9/5.0)+32;
		System.out.println("华氏度为"+b);
		}

}

　　

public class Friday2 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int a=5;
		int b=8;
		int c;
		System.out.println("a为"+a);
		System.out.println("b为"+b);
		c=b;
		b=a;
		a=c;
		System.out.println("a为"+a);
		System.out.println("b为"+b);
		}

}

　　

public class Friday3 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 int a=23456;
         int b=a/100;
        
         System.out.println("保留到百位"+b*100);
		

	}

}

　　

public class Thursday1 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		System.out.println("输入一个0~1000的整数");
		int x=345;
		
		int a=x%10;
		int m=x/10;
		int b=m%10;
		int n=m/10;
		int sum=(a+b+n);
		System.out.println("各位数之和是"+sum);
		}

}

　　

public class Friday4 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		char a='C';
		
		System.out.println((char)(a+32));
		char b='c';
		System.out.println((char)(b-32));
		

	}

}