《C++语言程序设计》自检自测题（三）及答案一、给出下列程序运行后的输出结果1．#include<iostream.h>void main(){int s1=0,s2=0;for(int i=0;i<10;i++)if(i%2)s1+=i;else s2+=i;cout<<s1<<’’<<s2<<endl;}2.#include<iostream.h>void main(){int a[8]={8,19,26,15,6,24,27,18};int i2=0,i3=0;for(int i=0;i<8;i++)if(a[i]%2==0)i2++;else if(a[i]%3==0)i3++;cout<<i2<<’’<<i3<<endl;}3.#include<iostream.h>void main(){int a[3][4]={{1,2,7,8},{5,6,11,12},{9,20,3,4}};int m=a[0][0];int ii=0,jj=0;for(int i=0;i<3;i++)for(int j=0;j<4;j++)if(a[i][j]>m){m=a[i][j];ii=i;jj=j;}cout<<ii<<’’<<jj<<’’<<a[ii][jj]<<endl;}4.#include<iostream.h>void main(){int a=10,b=15;cout<<a<<’’<<b<<endl;{a*=3;int b=a+20;cout<<a<<’’<<b<<endl;}cout<<a<<’’<<b<<endl;}5.#include<iomanip.h>void main(){int x=20,y=40,*p;p=&x;cout<<*p<<’’;*p=x+10;p=&y;cout<<*p<<endl;*p=y+20;cout<<x<<’’<<y<<endl;}6.#include<iostream.h>void SB(char ch){switch(ch){case ’A’:case’a’:cout<<”well!”;break;case ’B’:case’b’:cout<<”good!”;break;case ’C’:case’c’:cout<<”pass!”;break;default:cout<<”bad!”;break;}cout<<endl;}void main(){char a[6]=”Abcaf”;for(int i=0;a[i];i++)SB(a[i]);}7.#include<iostream.h>void main(){int a[8]={36,25,48,14,55,40,72,40}; int b1,b2;b1=b2=a[0];for(int i=1;i<8;i++)if(a[i]>b1){if(b1>b2)b2=b1;b1=a[i];}cout<<b1<<’’<<b2<<endl;}8.#include<iomanip.h>void main(){int a[8]={3,5,7,9,11,13,15,17}; int *p=1;for(int i=0;i<8;i++){cout<<setw(5)<<*p++;if((i+1)%3==0)cout<<endl;}}9.#include<iomanip.h>void LG(int* & a,int& m){a=new int [m];int *p=a;for(int i=0;i<m;i++)*p++=i*i;}void main(){int *b,n=5;LG(b,n);for(int i=0;i<n;i++)cout<<b[n-i-1]<<’’;cout<<endl;delete[]b;}10.#include<iostream.h>#include<string.h>struct Worker{char name[5];//姓名int age; //年龄float pay; //工资};void main(){char *t=”WeiRong”;int d=45;float f=1235;strcpy(,t);x.age=d;x.pay=f;cout<<<<’’<<x.age<<’’<<x.pay<<endl; }11.#include<iostream.h>void main(){int s=0;for(int i=1;i<=5;i++)s+=i*i;cout<<”s=”<<s<<endl;}12.#include<iostream.h>void main(){int s=0;for(int i=1;;i++){if(s>50)break;if(i%2==0)s+=i;}cout<<”i,s=”<<i<<”,”<<s<<endl;}13.#include<iomanip.h>int LB(int *a,int n){int s=1;for(int i=0;i<n;i++)s*=*a++;return s;}void main(){int a[]={1,2,3,4,5,6,7,8};cout<<LB(a,5)<<’’<<LB(&a[3],3)<<’’;cout<<LB(a+2,4)<<endl;}14.#include<iostream.h>char name[15];//姓名int age; //年龄float pay; //工资};void main(){Worker x{“wangfong”,43,640};Worker y,*p;y=x;p=&x;cout<<<<’’<<y.age<<’’<<y.pay<<endl;cout<<p->name<<’’<<p->age*2<<’’<<p->pay+100<<endl; }二、写出下列每个函数的功能1．#include<iostream.h>int S(int a,int b){if(a>b)return 1;else if(a==b)return 0;else return -1;}2.#include<math.h>bool SG(int x){ //x为大于等于2的整数int a=int(sqrt(x));//取x的平方根int i=2;while(i<=a){if(x%i==0)break;i++;}if(i<=a)return 0;else return 1;}3.// struct Worker{// char name[15];//姓名// int age; //年龄// float pay; //工资};void Q(Worker a[],int n){for(int i=0;i<n;i++)cin>>a[i].name>>a[i].age>>a[i].pay;}4.#include<iomanip.h>#include<fstream.h>void JD(char *fname)//可把以fname所指字符串作为文件标识符的文件称为fname文件 //假定该文件保存着一批整数{ifstream fin(fname,ios::in|ios::nocreate\ios::binary)int x,s=0,n=0;while(fin.read((char*)&x,sizeof(x))){s+=x;n++;}cout<<n<<’’<<s<<’’<<float(s)/n<<endl;fin.close();}5．float FI(int n){//n为大于等于1的整数float x,y=0;do{cin>>x;n--;y+=x*x;}while(n>0);return y;}6.#include<iostream.h>void WA(int a[],int n){for(int i=0;i<n-1;i++){int k=i;for(int j=i+1;j<n;j++)if(a[j]<a[k])k=j;int x=a[i];a[i]=a[k];a[k]=x;}}7.#include<iostream.h>void LI(int n){int *a=new int[n];for(int i=0;i<n;i++)cin>>a[i];for(i=n-1;i>=0;i--)cout<<*(a+i)<<’’;cout<<’\n’;delete []a;}8.#include<iomanip.h>#include<fstream.h>#include<string.h>void JA(char *fname)//可把以fname所指字符串作为文件标识符的文件称为fname文件{ofstream fout(fname);char a[20];cin>>a;while(strcmp(a,”end”)!=0){fout<<a<<endl;cin>>a;}fout.close();}9.int WC(int a[],int n,int k){int c=0;for(int i=0;i<n;i++)if(a[i]>=k)c++;return c;}10.#include<iostream.h>int *LJ(int a[],int n){int k=0;for(int i=1;i<n;i++)if(a[i]>a[k])k=i;return &a[k];}11.//struct DNode{// double data; //值域// DNode *next; //指针域//}；void QB(DNode* & f,int n){if(n==0){f=NULL;return;}f=new DNode;cin>>f->data;DNode *p=f;while(--n){p=p->next=new DNode;cin>>p->data;}p->next=NULL;}12.#include<iostream.h>#include<fstream.h>#include<string.h>int JB(char *fname,char *key)//可把以fname所指字符串作为文件标识符的文件称为fname文件，//假定该文件中保存着一批字符串，每个字符串的长度均小于20。
