大一下 c + + 上机实验总结（十四）

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#include <iostream>
#include<cstring>
using namespace std;
class s
{
public:
s() { *str = ''; len = 0; }
s( char *pstr )
{
strcpy( str,pstr );
len = strlen(pstr);
}
char *gets() {
return str;
}
int getLen() {
return len;
}
s connect( s obj );
//字符串连接函数声明
private:
char str[100];
int len;
};
s s::connect( s obj )
//字符串连接函数定义
{
strcat( str,obj.str );
return str;
}
int main()
{
s obj1( "Visual" ), obj2( " C++" ), obj3(" language");
obj3 = (obj1.connect(obj2)).connect(obj3);
//调用字符串连接函数
cout << "obj3.str = "<<obj3.gets() << endl;
cout<<"obj3.len = "<<obj3.getLen()<<endl;
return 0;
}

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#include <iostream>
#include<cstring>
using namespace std;
class s
{
public:
s()
{ *str = ''; len = 0; }
s( char *pstr )
{
strcpy( str,pstr );
len = strlen(pstr);
}
char *gets()
{
return str; }
int getLen()
{
return len; }
s operator+( s obj );
private:
char str[100];
int len;
};
s s::operator+( s obj )
{
strcat( str,obj.str );
return str;
}
int main()
{
s obj1( "Visual" ), obj2( " C++" ), obj3(" language");
obj3 = obj1 + obj2 + obj3;
cout << "obj3.str = "<<obj3.gets() << endl;
cout<<"obj3.len = "<<obj3.getLen()<<endl;
return 0;
}

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#include <iostream>
using namespace std;
class student
{
char name[20];
unsigned id;
double score;
public:
student(char s[20]="", unsigned k=0, double t=0)
{
strcpy(name,s);
id=k;
score=t;
}
void input()
{
cout<<"name? ";
cin>>name;
cout<<"id? ";
cin>>id;
cout<<"score? ";
cin>>score;
}
void output()
{
cout<<"name: "<<name<<"tid: "<<id<<"tscore: "<<score<<endl;
}
};
int main()
{
student s;
s.input();
s.output();
return 0;
}

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#include <iostream>
using namespace std;
class student
{
char name[20];
unsigned id;
double score;
public:
student(char s[20]="", unsigned k=0, double t=0)
{
strcpy(name,s);
id=k;
score=t;
}
friend ostream & operator<<(ostream &, const student &);
friend istream & operator>>(istream &, student &);
};
ostream & operator<<(ostream &out, const student &s)
{
out<<"name: "<<s.name<<"tid: "<<s.id<<"tscore: "<<s.score<<endl;
return out;
}
istream & operator>>(istream &in, student &s)
{
cout<<"name? ";
in>>s.name;
cout<<"id? ";
in>>s.id;
cout<<"score? ";
in>>s.score;
return in;
}
int main()
{
student s;
cin>>s;
cout<<s;
return 0;
}

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#include <iostream>
using namespace std;
class Array
{
int a[4][4];
public:
void set()
{
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
cin>>a[i][j];
}
int max();
double ave();
};
double Array::ave()
{
double sum=0;
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
sum=sum+a[i][j];
return sum/16;
}
int Array::max()
{
int maxv=a[0][0];
for(int i=0;i<4;i++)
for(int j=0;j<4;j++)
if(a[i][j]>maxv)
maxv=a[i][j];
return maxv;
}
int main()
{
Array a;
a.set();
cout<<a.ave()<<endl;
cout<<a.max()<<endl;
return 0;
}

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#include<iostream.h>
void sort_write(int *a,int *b,int n)
{int t;
for(i=0;i<n;i++)//对数组a进行选择法排序
for(int j=i+1;j<n)
if(a[i]>a[j])
{t=a[i];a[i]=a[j];a[j]=t;}
for(int i=0;i<n;i++)//将数组a的数据复制给数组b
b[i]=a[i];
}
void sort_write(float *a,float *b,int n)
{float t;
for(i=0;i<n;i++)//对数组a进行选择法排序
for(int j=i+1;j<n)
if(a[i]>a[j])
{t=a[i];a[i]=a[j];a[j]=t;}
for(int i=0;i<n;i++)//将数组a的数据复制给数组b
b[i]=a[i];
}
void sort_write(double *a,double *b,int n)
{double t;
for(i=0;i<n;i++)//对数组b进行选择法排序
for(int j=i+1;j<n)
if(a[i]>a[j])
{t=a[i];a[i]=a[j];a[j]=t;}
for(int i=0;i<n;i++)//将数组a的数据复制给数组b
b[i]=a[i];
}
int main()
{int n=10,a[]={12,5,7,9,1,3,23,6,10,2},a1[10];
double b[]={12.34,4.56,56.78,8.89,9.98,1.2,45.4,23.1,34.12,11.2},b1[10];
sort_write(a,a1,10);
sort_write(b,b1,10);
for(int i=0;i<10;i++)
cout<<a1[i]<<" ";
cout<<endl;
for(i=0;i<10;i++)
cout<<b1[i]<<" ";
cout<<endl;
return 0;
}
}

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#include <iostream>
#include <string>
using namespace std;
int main()
{
string *my_string;
int n;
cin>>n;
my_string=new string[n];
for(int i=0;i<n;i++)
cin>>my_string[i];
for(i=0;i<n;i++)
{
if(!my_string[i].find("A",0))//该find函数功能：返回字符串my_string[i]从位置0开始子串“A”第一次出现的位置；此行语句也可用if(my_string[i][0]=='A')
cout<<my_string[i]<<endl;
}
return 0;
}

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运行结果：
10
5
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15
5

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调用构造函数1.
4
8
调用构造函数2.
4
8
20
调用析构函数
调用析构函数