JAVA语言程序设计（基础篇）第十版课后题答案（第一章）

JAVA语言程序设计（基础篇）第十版课后题答案

第一章

第二题

/**

Created by ysy on /7/6.

*/

public class text2 {

public static void main(String[] args){

for(int i = 0; i < 5; i++)

System.out.println(“Welcome to Java”);

}

}

第三题

/**

Created by ysy on /7/6.

*/

public class text3 {

public static void main(String[] args){

System.out.println(" J A V V A");

System.out.println(" J A A V V A A");

System.out.println(“J J AAAAA V V AAAAA”);

System.out.println(" JJ A A V A A");

}

}

第四题

import java.util.Scanner;

/**

Created by ysy on /7/6.

*对输入数据求解一次方，平方，三次方

*/

public class text4 {

public static void main(String[] args){

Scanner input = new Scanner(System.in);char[] temp = new char[10];int num;for(int i = 0; i < 5; ++i){String Stemp;System.out.println("请输入数据：");Stemp = input.next();temp = Stemp.toCharArray();if(temp[0] >= 'a' && temp[0] <= 'z'){System.out.println(temp[0]+" "+temp[0]+"^2 " + temp[0] + "^3");}else if(temp[0] >= '0' && temp[0] <= '9'){num = temp[0] - '0';System.out.println(num+" "+(int)Math.pow(num, 2)+" "+(int)Math.pow(num, 3));}}

}

}

第七题

import java.util.Scanner;

/**

Created by ysy on /7/6.

*对输入数据求解一次方，平方，三次方

*/

public class text4 {

public static void main(String[] args){

Scanner input = new Scanner(System.in);char[] temp = new char[10];int num;for(int i = 0; i < 5; ++i){String Stemp;System.out.println("请输入数据：");Stemp = input.next();temp = Stemp.toCharArray();if(temp[0] >= 'a' && temp[0] <= 'z'){System.out.println(temp[0]+" "+temp[0]+"^2 " + temp[0] + "^3");}else if(temp[0] >= '0' && temp[0] <= '9'){num = temp[0] - '0';System.out.println(num+" "+(int)Math.pow(num, 2)+" "+(int)Math.pow(num, 3));}}

}

}

第八题

/**

Created by ysy on /7/6.

*/

public class text8 {

static double pi=3.14;

public static void main(String arg[]){

double r=5.5;double a=getLength(r);double b=getArea(r);System.out.println("周长:"+a);System.out.println("面积:"+b);

}

public static double getLength(double r){

return 2rpi;

}

public static double getArea(double r){

return rrpi;

}

}

第九题

/**

Created by ysy on /7/6.

*/

public class text9 {

public static void main(String[] arg){

double a=14/1.6;

double t=45.5/60;

double v=a/t;

System.out.println(“速度”+v);

}

}

第十一题

/**

Created by ysy on /7/6.

/

public class text11 {

public static void main(String arg[]){

int now_num=312032486;

int time=365246060;

int spring=time/7;

int die=time/13;

int move=time/45;

int num=now_num+spring-die+move;

System.out.println(num);

}

}

第十二题

/**

Created by ysy on /7/6.

/

public class text12 {

public static void main(String[] arg){

double a=3.4;

double b=50.24;

double c=2.1;

double d=0.55;

double e=44.5;

double f=5.9;

double x=(ed-bf)/(ad-bc);

double y=(af-ec)/(ad-b*c);

System.out.println(“x:”+x);

System.out.println(“y:”+y);

}

}