以下是C++的不同数据类型值的比较语句，请问这些判断语句中作为条件部分的语句编写有问题的有（）。 A: 如果变量bVar是布尔类型：if（false==bVar）{doSomeThing（）；} B: 如果变量nVar是int型：if（0==nVar）{doSomeThing（）；} C: 如果变量fVar为浮点型：if（0.02=fVar）{doSomeThing（）；} D: 如果变量sVar为字符串型：if（""==sVar）{doSomeThing（）；}

用以下语句定义了一个委托类型Dosomething: delegate void Dosomething() 则类someclass 中的下列哪些方法可以关联到该委托的实例？（） 多项选择题( 3 分)

事件的触发方式: addEventListenter(“click”, “doSomething”, “true”),其中，若第三参数为true，则采用

下面代码的作用是让doSomeThing函数每隔1秒被调用1次。请问哪里有问题（） A: 没有将timer加入runloop B: doSomeThing缺少参数 C: 忘记传递数据给userInfo D: myTimer对象未通过[[myTimeralloc]init]方法初始化

哪一个语言结构最能代表以下多路分支if语句的选择结构。 <?php if ( $a == "a" ) { somefunction ; } else if ( $a == "b" ) { anotherfunction; } else if ( $a == "c" ) { dosomething; } else { donothing; } ?>

以下关于JavaScript函数说法正确的有哪些? A: 函数是一组逻辑相关代码的集合。 B: JavaScript函数使用function关键字声明，且无需声明返回类型，即使不返回数据也不用特殊说明。 C: JavaScript函数可以如下声明：functiondoSth(a,b){//dosomething} D: JavaScript函数可以如下声明：vardoSth= function(a,b){//dosomething}; E: JavaScript中函数可作为一个对象来看待，因此函数是可以传递的。比如:functiondosth(){...}varfunc=dosth;

从下面四段代码中选择出正确的代码段（） A: public class Something {public static void main(String[] args) {Other o = new Other();new Something().addOne(o);}public void addOne(final Other o) {o.i++;}}class Other {public int i;} B: public class Something {void doSomething () {private String s = ̶”;int l = s.length();}} C: abstract class Name {private String name;public abstract boolean isStupidName(String name) {}} D: public class Something {public int addOne(final int x) {return ++x; }}

从下面四段（A，B，C，D）代码中选择出正确的代码段 A: abstract class Name { private String name; public abstract boolean isStupidName(String name) {} } B: public class Something { void doSomething () { private String s = ""; int l = s.length(); } } C: public class Something { public static void main(String[] args) { Other o = new Other(); new Something().addOne(o); } public void addOne(final Other o) { o.i++; } } class Other { public int i; } D: public class Something { public int addOne(final int x) { return ++x; } }

编写程序题 1.定义一个Animal类（可以定义成抽象类）至少具有跑(run())功能, 2.定义Dog类继承自Animal类,重写run()方法,并添加protectHome()方法 3.定义Fish类继承自Animal类,重写run()方法,并添加swim()方法 4.在主类中定义一个doSomething(Animal animal)方法接收用户传入动物，根据用户传入的具体动物，使用instanceof 关键字，判断具体是何种动物再执行该动物特有的方法如是执行swim()还是protectHome()方法.注意需要用类转换，执行该动物的特有方法。

回答下面的题目：Do you ever wish you were moreoptimistic，someone who always(51) __________ to be successful?Having someone around whoalways(52) __________the worst isn’t really a lot of(53) __________．We all know someone who sees a single cloud on asunny day and says，“It looks(54)rain．”But if you catch yourself thinkingsuch things，it’s important to dosomething(5 5) __________it．You can change your view of life，(56) __________to psychologists．It only takes a little effort，and you’llfind life more rewarding as a(57) __________．Optimism，they say，is partly about self—respectedconfidence but it’s also a more positive way of looking at life and all it hasto(58) __________．Optimists are more(59) __________tostart new projects and are generally more prepared to take risks．Upbringing is obviously veryimportant in forming your(60) __________to the world．Some people are brought up to(61) __________toomuch on others and grow up forever blaming other people when anything(62) __________wrong．Most optimists，on the(63) __________hand，have been brought up not to(64) __________failure as the end of theworld-they just(65) __________with their lives． A: supply B: suggest C: offer D: propose