1.编写一个程序,定义圆的半径,求圆的面积.
package HomeWork; public class work1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int r = 2; double area; area = r * r * 3.14; System.out.println("半径是2时,圆的面积" + area); } }
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。(知识点:变量和运算符综合应用)
package HomeWork; public class work2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double hua = 50; double she; she = (hua - 32) * 5 / 9; // 华转摄 System.out.println("当华氏度是50时,转化为的摄氏度是" + she); } }
package HomeWork; public class work3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double hua; double she = 30; hua = she * 9 / 5 + 32; // 摄转华 System.out.println("当摄氏度是30时,转化的华氏度是" + hua); } }
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。(知识点:变量和运算符综合应用)
package HomeWork; public class work4 { /** * @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=" + a + "\tb=" + b); System.out.println("互换后"); c = a; a = b; b = c; System.out.println("a=" + a + "\tb=" + 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 HomeWork; public class work5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a = 12345; int wan = 12345 / 10000; int qian = 12345 % 10000 / 1000; int bai = 12345 % 10000 % 1000 / 100; System.out.println(wan * 10000 + qian * 1000 + bai * 100); } }
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 HomeWork; public class work6 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a = 345; int ge = a % 10; int shi = a % 100 / 10; int bai = a / 100 % 10; int sum = ge + shi + bai; System.out.println("个位是" + ge + "\t十位是" + shi + "\t百位是" + bai); System.out.println(sum); } }
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)
定义一个任意的小写字母a~z,转换为大写字母
package HomeWork; public class work7 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub char a = 'a'; char b = 'a' - 32; System.out.println("a" + "\n转化后"); System.out.println(b); } }
package HomeWork; public class work8 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub char a='A'; char b='A'+32; System.out.println("A"+"\n转化后"); System.out.println(b); } }
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