5.1编写一系列条件测试;将每个测试以及你对其结果的预测和实际结果都打印出来.你编写的代码应类似于下面这样: car = 'subaru' print("Is car == 'subaru'? I predict True.") print(car == 'subaru') print("\nIs car == 'audi'? I predict False.") print(car == 'audi') health = "great" pri…
编写一个程序,询问用户要租赁什么样的汽车,并打印一条消息,如"Let me see if I can find you a Subaru" car =input("What kind ofretal car you would like:") print(f"Let me see if I can find you a {car}") 编写一个程序,询问用户有多少人用餐.如果超过8人,就打印一条消息,指出没有空桌;否则指出有空桌 people =…
1.Introduction 2.First-order Differential Equations Exercise2.1. Find solutons of the following intial-value problems in $\bbR^2$: (1)$2u_y-u_x+xu=0$ with $u(x,0)=2xe^{x^2/2}$; (2)$u_y+(1+x^2)u_x-u=0$ with $u(x,0)=\arctan x$. Solution: (1)Since $(-1,…
创建一个类, 它包含一个未初始化的String引用.验证该引用被Java初始化成了null package net.mindview.initialization; public class Test1 { public String str; public static void main(String[] args) { Test1 t = new Test1(); System.out.println(t.str); } } 返回结果 null 创建一个类, 它包含一个在定义时就被初始化了…
第五章习题 5.1 package ex0501; //[5.1]创建一个类,它包含一个未初始化的String引用.验证该引用被Java初始化成null class TestDefaultNull { public String string; } public class DefaultNull { public static void main(String[] args) { TestDefaultNull test = new TestDefaultNull(); System.out.…
