C 程序设计教程课后习题答案【钱能】清华版

2．61)pleaseinput3sidesofonetriangle:6,6,8a=6.00,b=6.00,c=8.00areaoftriangleis17.888542)该程序计算三角形的面积前后分为三部分：输入，处理，输出。2．7Inmain():Entertwonumbers:38Callingadd():Inadd(),received3and8andreturn11Backinmain():cwassetto11Exiting...3．1(1)sqrt(pow(sin(x),2.5))(2)(a*x+(a+x)/(4*a))/2(3)pow(c,x*x)/sqrt(2*M_PI)//M_PI为BC中math.h中的圆周率常数3．213.72.593．3(1)a1=1 a2=1(2)1.1(3)2,0.0(4)205．4Main--x=5,y=1,n=1Func--x=6,y=21,n=11Main--x=5,y=1,n=11Func--x=8,y=31,n=215．6doublepoly(intn,double){if(n==0)return1;if(n==0)returnx;return((2*n-1)*x*poly(n-1,x)-(n-1)*poly(n-2,x))/n;}6．1//6_1(1)//file1.cppintx=1;intfunc(){//...}//file2.cppexternintx;intfunc();voidg(){x=func();}//file3.cppexternintx=2;//error:externint变量若有赋值，则成定义intg();//error:函数声明与前面不一致voidmain(){x=g();//...}(2)//file1.cppintx=5;inty=8;externintz;//file2.cppintx;//error:intx;重复定义externdoubley;//error:y同一名字不同类型定义externintz;//error:z只有声明，却无定义6．22510．4//10_4(1)见10_4_1.cpp(2)data?3data?5data?7data?6data?4data?8data?-3357648(3)见10_4_312．1Constructingnormally.Constructingwithanumber:20Displayanumber:1Displayanumber:20Destructing.Destructing.12．2//12_2//见employee.h//employee.cpp12．3//12_3.txt//见employ.h//employ.cpp//13_1.txt物质有机物生物 动物 哺乳动物 人类 猿类 猫科类 ... 卵生动物 植物非生物无机物//13_2Ignore//14_1Multi[0]is:0Multi[1]is:1Multi[2]is:4Multi[3]is:9Multi[4]is:16Multi[5]is:25Multi[6]is:36Multi[7]is:49Multi[8]is:64Multi[9]is:81Destroying..9Destroying..8Destroying..7Destroying..6Destroying..5Destroying..4Destroying..3Destroying..2Destroying..1Destroying..0//14_2//运行结果为：12345678910//增加拷贝构造函数后的运行结果为：0149162536496481//14_3//运行结果为：createaXobjectwith1createaXobjectwith2//创建临时对象callafuncwithparaXobjectcreateaXobjectfromotherXobjecteraseaobject//析构临时对象createaXobjectfromotherXobjectcallafuncwithparaXobjectcreateaXobjectfromotherXobjecteraseaobjecteraseaobjecteraseaobjecteraseaobject17．1classA{public:intGetpA(){returnpA;}voidSetpA(inta){pA=a;}private:intpA;};classB:publicA{public:voidOnB(){}};classC:virtualpublicA,virtualpublicB{public:Sc(){/*useGetpA()andSetpA()...*/}};19．5DillArnson