第一章大黑書課後題答案

樓主後續還會陸續把其他章答案發上去，喜歡的關注樓主一下

public class Exercise01_01 {
  public static void main(String[] args) {
    System.out.println("Welcome to Java");
    System.out.println("Welcome to Computer Science");
    System.out.println("Programming is fun");
  }
}

public class Exercise01_02 {
  public static void main(String[] args) {
    System.out.println("Welcome to Java");
    System.out.println("Welcome to Java");
    System.out.println("Welcome to Java");
    System.out.println("Welcome to Java");
    System.out.println("Welcome to Java");
  }
}
 

public class Exercise01_03 {
  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(" J J   A     A     V    A     A  ");
  }
}
 

public class Exercise01_04 {
  public static void main(String[] args) {
    System.out.println("a      a^2    a^3");  
    System.out.println("1      1      1");   
    System.out.println("2      4      8");
    System.out.println("3      9      27");
    System.out.println("4      16     64");
  }
}
 

public class Exercise01_05 {
  public static void main(String[] args) {
    System.out.println((9.5 * 4.5 - 2.5 * 3) / (45.5 - 3.5));
  }
}

public class Exercise01_06 {
  public static void main(String[] args) {
    System.out.println(1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9);
  }
}

public class Exercise01_07 {
  public static void main(String[] args) {
    System.out.println(4 * (1 - 1.0 / 3 + 1.0 / 5 - 1.0 / 7 +
        1.0 / 9 - 1.0 / 11 + 1.0 / 13));
  }
}

public class Exercise01_08 {
  public static void main(String[] args) {
  	// Display area
    System.out.println(5.5 * 5.5 * 3.14159);

    // Display perimeter
    System.out.println(2 * 5.5 * 3.14159);
  }
}

public class Exercise01_09 {
  public static void main(String[] args) {
  	// Display area
    System.out.println(4.5 * 7.9);

    // Display perimeter
    System.out.println(2 * (4.5 + 7.9));
  }
}
//來源蕪湖大司馬

public class Exercise01_10 {
  public static void main(String[] args) {
    System.out.println((14 / 45.5) * 60 / 1.6);
  }
}

public class Exercise01_11 {
  public static void main(String[] args) {
    System.out.println(312032486 + 365 * 24 * 60 * 60 / 7.0 - 365 * 24 * 60 * 60 / 13.0 + 365 * 24 * 60 * 60 / 45.0);
    System.out.println(312032486 + 2 * 365 * 24 * 60 * 60 / 7.0 - 2 * 365 * 24 * 60 * 60 / 13.0 + 2 * 365 * 24 * 60 * 60 / 45.0);
    System.out.println(312032486 + 3 * 365 * 24 * 60 * 60 / 7.0 - 3 * 365 * 24 * 60 * 60 / 13.0 + 3 * 365 * 24 * 60 * 60 / 45.0);
    System.out.println(312032486 + 4 * 365 * 24 * 60 * 60 / 7.0 - 4 * 365 * 24 * 60 * 60 / 13.0 + 4 * 365 * 24 * 60 * 60 / 45.0);
    System.out.println(312032486 + 5 * 365 * 24 * 60 * 60 / 7.0 - 5 * 365 * 24 * 60 * 60 / 13.0 + 5 * 365 * 24 * 60 * 60 / 45.0);
  }
}

public class Exercise01_12 {
  public static void main(String[] args) {
    System.out.println(24 / (1 + (40 + 35.0 / 60) / 60) * 1.6);
  }
}

public class Exercise01_13 {
  public static void main(String[] args) {
    System.out.println("x is ");
    System.out.println((44.5 * 0.55 - 50.2 * 5.9) / 
        (3.4 * 0.55 - 50.2 * 2.1));
    
    System.out.println("y is ");
    System.out.println((3.4 * 5.9 - 44.5 * 2.1) / 
        (3.4 * 0.55 - 50.2 * 2.1));
  }
}