第二次作业
1.编写一个程序,定义圆的半径,求圆的面积.
package z1; public class Area { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double a = 2; double s = a*a*3.14; System.out.println(s); } }
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 z1; public class z2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double hua = 50; double hua1 = hua-32; double che = hua1*5/9; double che1 = 30*9/5; double hua2= che1+32; System.out.println(che); System.out.println(hua2); } }
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 z1; public class z2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a = 2; int b = 3; int c ; c = b; b = a; a = c; System.out.println(a); System.out.println(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
package z1; public class z2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a = 12345; int b = a/100*100; System.out.println(b); } }
5.输入一个0~1000的整数,求各位数的和
package z1; public class z2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a = 123; int b = 345; int c = a%100%10; int d = b%100%10; System.out.println(c+d); } }
6.定义一个任意的大写字母A~Z,转换为小写字母,定义一个任意的小写字母a~z,转换为大写字母。
package z1; public class z2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub char a = 65; char A = 65+32; System.out.println(a); System.out.println(A); } }