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
原文:https://www.cnblogs.com/adafei/p/11189631.html