Java语言程序设计与数据结构基础篇第一章编程练习题

    
1.1
public class Exercises{
  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");
  }
}

1.2
public class Exercises{
  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");
  }
}

1.3
public class Exercises{
  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");
  }
}

1.4
public class Exercises{
  public static void main(String[] args) {
	  System.out.println("a   a^2  a^3");
	  System.out.println(1 + "   " + 1 * 1 + "    " + 1 * 1 * 1);
	  System.out.println(2 + "   " + 2 * 2 + "    " + 2 * 2 * 2);
	  System.out.println(3 + "   " + 3 * 3 + "    " + 3 * 3 * 3);
	  System.out.println(4 + "   " + 4 * 4 + "   " + 4 * 4 * 4);
  }
}

1.5
public class Exercises{
  public static void main(String[] args) {
	  System.out.println((9.5 * 4.5 - 2.5 * 3) / (45.5 - 3.5));
  }
}
显示结果：0.8392857142857143

1.6
public class Exercises{
  public static void main(String[] args) {
	  System.out.println(1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9);
  }
}
显示结果：45

1.7
public class Exercises{
  public static void main(String[] args) {
	  System.out.println(4 *(1.0 - 1.0 / 3 + 1.0 / 5 - 1.0 / 7 + 1.0 / 9 - 1.0 / 11));
	  System.out.println(4 *(1.0 - 1.0 / 3 + 1.0 / 5 - 1.0 / 7 + 1.0 / 9 - 1.0 / 11 + 1.0 / 13));
  }
}
显示结果：
2.9760461760461765
3.2837384837384844

1.8
public class Exercises{
  public static void main(String[] args) {
	  System.out.println("周长:" + 2 * 5.5 * 3.14);
	  System.out.println("面积:" + 5.5 * 5.5 * 3.14);
  }
}
显示结果：
周长:34.54
面积:94.985

1.9
public class Exercises{
  public static void main(String[] args) {
	  System.out.println("周长:" + 2 * (4.5 + 7.9));
	  System.out.println("面积:" + 4.5 * 7.9);
  }
}
显示结果：
周长:24.8
面积:35.550000000000004

1.10
public class Exercises{
  public static void main(String[] args) {
	  System.out.println("平均速度:" + (14.0 / 1.6) / ((45.0 * 60 + 30) / 3600));
  }
}
显示结果：
平均速度:11.538461538461538

1.11
public class Exercises{
  public static void main(String[] args) {
	  System.out.println("未来1年人口:" + (312032486 + 60 * 60 * 24 * 365 / 7.0 - 60 * 60 * 24 * 365 / 13.0 + 60 * 60 * 24 * 365 / 45.0));
	  System.out.println("未来2年人口:" + (312032486 + (60 * 60 * 24 * 365 / 7.0 - 60 * 60 * 24 * 365 / 13.0 + 60 * 60 * 24 * 365 / 45.0) * 2));
	  System.out.println("未来3年人口:" + (312032486 + (60 * 60 * 24 * 365 / 7.0 - 60 * 60 * 24 * 365 / 13.0 + 60 * 60 * 24 * 365 / 45.0) * 3));
	  System.out.println("未来4年人口:" + (312032486 + (60 * 60 * 24 * 365 / 7.0 - 60 * 60 * 24 * 365 / 13.0 + 60 * 60 * 24 * 365 / 45.0) * 4));
	  System.out.println("未来5年人口:" + (312032486 + (60 * 60 * 24 * 365 / 7.0 - 60 * 60 * 24 * 365 / 13.0 + 60 * 60 * 24 * 365 / 45.0) * 5));
  }
}
显示结果：
未来1年人口:3.148125827032967E8
未来2年人口:3.175926794065934E8
未来3年人口:3.203727761098901E8
未来4年人口:3.231528728131868E8
未来5年人口:3.2593296951648355E8

1.12
public class Exercises{
  public static void main(String[] args) {
	  System.out.println("平均速度:" + (24 * 1.6) / ((60 * 60 + 40 * 60 + 30) / 3600.0) + "千米每小时");
  }
}
显示结果：
平均速度:22.92537313432836千米每小时

1.13
public class Exercises{
  public static void main(String[] args) {
	  System.out.println("x:" + (44.5 * 0.55 - 50.2 * 5.9) / (3.4 * 0.55 - 50.2 * 2.1));
	  System.out.println("y:" + (3.4 * 5.9 - 44.5 *2.1) / (3.4 * 0.55 - 50.2 * 2.1));
  }
}
显示结果：
x:2.623901496861419
y:0.7087397392563978