JAVA Programming Language Fundamentals Chapter 6

  Chapter 6 homework after class
: computer practice 1
package tz1;

public class dome1 {
 public static void main(String[] args) {
  
      int sum=0;
      for (int num =1; num<=99; num+=2) {
       sum+=num;
       System.out.println(sum);
  }
 }

}

Hands -on exercise 4 Verify user login information
package tz1;

import java.util.Scanner;
/*
 * Hands-on exercise 4 to verify user login information
 */
public class dome2 {
 public static void main(String[] args) {
  String name ;//Define username
  String password ;//Define user Password
  int fas = 3;//Define the number of wrong
  
  input Scanner input = new Scanner(System.in);
  for (int i = 1; i <= 3; i++) {
   System.out.println("Please enter the user name :");
   name = input.next();

   System.out.println("Please enter password:");
   password = input.next();
    
   if (name.equals("jim") || password.equals("123456")) {
    System.out.println( "Welcome to log in to the system");
    break;
   }
   if (i == 3) {
    
    System.out.println("Sorry, you entered the wrong input 3 times");
    break;
   } else {
    System.out.println("Incorrect input ! You still have " + (fas - i) + "chance");

    continue;
   }
  }
 }

}
Short Answer Question
1 Calculate the average study time from Monday to Friday
package com.bdqn.dome;
 import java.util.Scanner;
public class dome8 {
 public static void main(String[] args) {
  Scanner input = new Scanner(System. in);
  
  double total=0;
  for (int i = 0; i < 5; i++) {
   System.out.println("Please enter the learning time of the week"+(i+1)+":");
   double time = input.nextDouble();
   total += time;
  }
  System.out.println("The average study time from Monday to Friday is "+total/5.0+"hours");
 }

}
2 Find the number of chickens and rabbits
package com.bdqn.dome;

public class dome9 {
 public static void main(String[] args) {
  int chookNum, rabitNum;
  for (chookNum = 0; chookNum < 35; chookNum++) {
   // chicken equals 0 chicken is less than 35 chicken count plus 1
   // rabbit's The number is equal to 35 minus the number of chickens
   rabitNum = 35 - chookNum;
   if (2 * chookNum + 4 * rabitNum == 94) {

    System.out.println("chicken has" + chookNum + "only, no" + rabitNum + "only");
   }

  }

 }
}
3. FlipFlop game
package com.bdqn.dome;

//Develop a game titled "flipfoip"
public class dome10 {
 public static void main(String[] args) {
  for (int i = 1; i <= 100; i++) {
   if (i % 3 == 0 && i % 5 == 0) {// if divisible by 3 and divisible by 5
    System.out.println("flipfoip");// output flipfoip
   } else if (i % 5 == 0) {
    System. out.println("foip");
   } else if (i % 3 == 0) {
    System.out.println("flip");
   } else {
    System.out.println(i);
   }
  }
 }

}
4. Number of men, women, children.
package com.bdqn.dome;

public class dome11 {
 public static void main(String[] args) {
  int man, women, kids;
  for (kids = 1; kids <= 50; kids++) {
   for (women = 1; women < 25; women++) {
    for (man = 1; man < 16; man++) {
     if (3 * man + 2 * women + kids == 50) {
      if (man + women + kids == 30) {
      }
      System.out.println("男人有" + man + "女人有" + women + "小孩有" + kids);
     }

    }
   }
  }
 }

}