C++程序設計習題答案第2章8.#include<iostream>usingnamespacestd;intmain(){charc1='C',c2='h',c3='i',c4='n',c5='a';c1+=4;c2+=4;c3+=4;c4+=4;c5+=4;cout<<"passwordis:"<<c1<<c2<<c3<<c4<<c5<<endl;return0;}第3章2.#include<iostream>#include<iomanip>usingnamespacestd;intmain(){floath,r,l,s,sq,vq,vz;constfloatpi=3.1415926;cout<<"pleaseenterr,h:";cin>>r>>h;l=2*pi*r;s=r*r*pi;sq=4*pi*r*r;vq=3.0/4.0*pi*r*r*r;vz=pi*r*r*h;cout<<setiosflags(ios::fixed)<<setiosflags(ios::right)<<setprecision(2);cout<<"l="<<setw(10)<<l<<endl;cout<<"s="<<setw(10)<<s<<endl;cout<<"sq="<<setw(10)<<sq<<endl;cout<<"vq="<<setw(10)<<vq<<endl;cout<<"vz="<<setw(10)<<vz<<endl;return0;}3.#include<iostream>usingnamespacestd;intmain(){floatc,f;cout<<"請輸入一個華氏溫度:";cin>>f;c=(5.0/9.0)*(f-32);//注意5和9要用實型表示,否則5/9值為0cout<<"攝氏溫度為:"<<c<<endl;return0;};4.#include<iostream>usingnamespacestd;intmain(){charc1,c2;cout<<"請輸入兩個字符c1,c2:";c1=getchar();c2=getchar();//將輸入的第一個字符賦給c1//將輸入的第二個字符賦給c2cout<<"用putchar函數(shù)輸出結果為:";putchar(c1);putchar(c2);cout<<endl;cout<<"用cout語句輸出結果為:";cout<<c1<<c2<<endl;return0;}9.第一種：#include<iostream>usingnamespacestd;intmain(){inta,b,c;cout<<"pleaseenterthreeintegernumbers:";cin>>a>>b>>c;if(a<b)if(b<c)cout<<"max="<<c;elsecout<<"max="<<b;elseif(a<c)cout<<"max="<<c;elsecout<<"max="<<a;cout<<endl;return0;}第二種：#include<iostream>usingnamespacestd;intmain(){inta,b,c,temp,max;cout<<"pleaseenterthreeintegernumbers:";cin>>a>>b>>c;temp=(a>b)?a:b;/*將a和b中的大者存入temp中*/max=(temp>c)?temp:c;cout<<"max="<<max<<endl;return0;/*將a和b中的大者與c比較，最大者存入max*/}10.#include<iostream>usingnamespacestd;intmain(){intx,y;cout<<"enterx:";cin>>x;if(x<1){y=x;cout<<"x="<<x<<",y=x="<<y;}elseif(x<10)//1≤x＜10{y=2*x-1;cout<<"x="<<x<<",y=2*x-1="<<y;}else//x≥10{y=3*x-11;cout<<"x="<<x<<",y=3*x-11="<<y;}cout<<endl;return0;}11.#include<iostream>usingnamespacestd;intmain(){floatscore;chargrade;cout<<"pleaseenterscoreofstudent:";cin>>score;whi