第一次作业
1. 定义圆形半径,求面积。int r =5
package ccc; import java.util.Scanner; public class ccc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("输入半径"); int a=3; double b=a*a*3.14; System.out.println("面积为"+b); } }
2.华氏温度和摄氏温度互相转换,从华氏度变成摄氏度你只要减去32,乘以5再除以9就行了,将摄氏度转成华氏度,直接乘以9,除以5,再加上32即行。
package ccc; import java.util.Scanner; public class ccc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("输入华氏温度"); double a=in.nextDouble(); double b=(a-32)*5/9; System.out.println("摄氏温度为"+b); System.out.println("输入摄氏温度"); double c=in.nextDouble(); double d=c*9/5+32; System.out.println("华氏温度为"+d); } }
3.已知a,b均是整型变量,写出将a,b两个变量中的值互换的程序。
package ccc; import java.util.Scanner; public class ccc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("输入a"); int a=in.nextInt(); System.out.println("输入b"); int b=in.nextInt(); int c; c=a; a=b; b=c; System.out.println("a为"+a); System.out.println("b为"+b); } }
4.定义一个任意的5位整数,将它保留到百位,无需四舍五入(知识点:变量和运算符综合应用)
package ccc; import java.util.Scanner; public class ccc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("输入一个五位数"); int a=35657; int b=a%100; int c=a-b; System.out.println("保留到百位为"+c); } }
5.输入一个0~1000的整数,求各位数的和,例如345的结果是3+4+5=12注:分解数字既可以先除后模也可以先模后除(知识点:变量和运算符综合应用)
package ccc; import java.util.Scanner; public class ccc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("输入一个0-1000的数"); int a=in.nextInt(); int b,c,d,e; b=a/100; c=a%100/10; d=a%10; e=b+c+d; System.out.println("和为"+e); } }
6.定义一个任意的大写字母A~Z,转换为小写字母(知识点:变量和运算符综合应用)
package ccc; import java.util.Scanner; public class ccc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); char a='A'; char b=(char)(a+32); System.out.println("小写为"+b); } }
7.输入一个任意的小写字母a~z,转换为大写字母
package ccc; import java.util.Scanner; public class ccc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("请输入一个小写字母"); char a=in.next().charAt(0); char b=(char)(a-32); System.out.println("大写为"+b); } }