ch7

A 基本部分。

1、用函数的递归调用完成求输入的十个整数最大值的功能。

#include <iostream.h>int num[10];int findmax(int n){if(n==2)return num[0]>num[1]?num[0]:num[1];elsereturn num[n-1]>findmax(n-1)?num[n-1]:findmax(n-1); }void main(){cout<<"please input 10 integers:"<<endl;for(int i=0;i<10;i++)cin>>num[i];cout<<"the max integer is:"<<findmax(10)<<endl;}2、用数组名作函数的形参和实参，完成求其最大值的功能。

#include <iostream.h>int max(int a[],int n){int max=a[0];for(int i=0;i<n;i++)if(max<a[i])max=a[i];return max;}void main(){int i,n,b[100];cout<<"please input the number of the array:"<<endl;cin>>n;for(i=0;i<n;i++)cin>>b[i];cout<<"the max is:"<<max(b,n)<<endl;}3、276，7#include <iostream>#include<string>#include<fstream>using namespace std;main(){char ANSWER[30],number[30],answer[30];ifstream infile("exams.dat");if(!infile){cout<<"open error!"<<endl;exit(0);}ofstream outfile("scores.dat");if(!outfile){cout<<"open error!"<<endl;exit(0);}infile>>ANSWER;while(infile>>number){int count=0;bool flag=0;infile>>answer;outfile<<number<<" ";if(strlen(answer)>20)outfile<<"Too many answers"<<endl;else if(strlen(answer)<20)outfile<<"Too few answers"<<endl;else{for(int i=0;i<strlen(answer);i++)if(answer[i]>'f'||answer[i]<'a'){flag=1;break;}if(flag)outfile<<"Ivalid answers"<<endl;else{for(i=0;i<strlen(answer);i++)if(ANSWER[i]==answer[i])count++;outfile<<count<<endl;}}}Infie.close();Outfile.close();}4、P275，6#include<iostream>#include<string>#include<fstream>using namespace std;main(){ifstream infile;char str[30],letter;int n;string word[30];cout<<"Enter string :"<<endl;cin>>str;n=strlen(str);for(int i=0;i<n;i++){if(str[i]>='a'&&str[i]<='z') //将小写字母转化为大写字母str[i]=str[i]-32;infile.open("alphabet.dat");if(!infile){cout<<"open error!"<<endl;return 0;}while(infile>>letter)if(letter==str[i]){infile>>word[i];}infile.close();}cout<<"Phonetic version is:";for(i=0;i<n;i++)cout<<word[i]<<" ";infile.close();}5、用函数完成有关员工信息的查询，从文件中查找你所要查找的某个人的信息，信息包括电话号码和住址。

#include<iostream>#include<string>#include<fstream>using namespace std;void find(char a[],char b[]){char NAME[30],addr[30],tele[30];fstream infile;infile.open(b);if(!infile) //判断文件是否正常打开{cout<<"open error!"<<endl;exit(0);}while(infile>>NAME){if(strcmp(a,NAME)==0){infile>>addr>>tele;cout<<a<<" "<<addr<<" "<<tele<<endl;}}}main(){char name[30];char file[30];cout<<"please input the name:"<<endl;cin>>name; //输入要查询的名字cout<<"please input the address of the file:"<<endl;cin>>file; //输入要查询文件的路径find(name,file);}B附加题。

1、以下程序的执行结果是_____#includeint x=1;void func(int);void main(){func(x);cout<<"x="<<x;}void func(int x);{x=3;答案：x=12.以下程序的执行结果是______。

#include “iostream.h”void func(int);void main(){int x=10;func(x);cout<<"x="<<x ;}void func(int x){x=20;}答案：X=103.以下程序的执行结果是_______。

#include “iostream.h”static int x=5;void f1();void f2();void main(){auto int x=3;f1();f2();cout<<x ;}void f1(){x+=1;cout<<x ;}void f2(){int x=1;cout<<x ;}答案：6134.以下程序的执行结果是______。

#include “iostream.h”void func(int);void main(){int k=4;func(k);func(k);cout<<k;}void func(int a){static int m=0;m+=a;cout<<m;}答案：4845.以下程序的执行结果是________。

#include “iostream.h”void sub(float x,float *y,float *z){*y=*y-1.0;*z=*z+x;}void main(){float a=2.5,b=9.0,*pa,*pb;pa=&a;pb=&b;sub (b-a,pa,pb);cout<< a<<b;}答案：1.515.56.以下程序是执行结果是______。

#include “iostream.h”void fun(float *a,float *b){float w;*a=*a+*a;w=*a;*a=*b;*b=w;}void main(){float x=2.0,y=3.0;float *px=&x,*py=&y;fun(px,py);cout<<x<<b ;}答案：347.以下程序的执行结果是_______。

#include “iostream.h”f(int b[],int n){int I,r=1;for (I=0;I<=n;I++) r=r*b[I];return r;}void main(){int x,a[]={2,3,4,5,6,7,8,9};x=f(a,3);cout<<x;}答案：1208.以下程序的执行结果是______。

#include “iostream.h”void fun(int *s,int n1,int n2){int i,j,t;i=n1;j=n2;while (i<=J){t=*(s+i);*(s+i)=*(s+j);*(s+j)=t;i++;j--;}}void main(){int a[10]={1,2,3,4,5,6,7,8,9,0},I,*p=a; fun(p,0,3);fun(p,4,9);fun(p,0,9);for (I=0;I<10;I++)cout<<*(a+I);cout<<”n”;}答案：5678901234n9.以下程序的执行结果是______。