copy ,abs,includes 3个函数

copy:

 Copy函数原型：标头: <algorithm>

OutputIterator copy(

InputIterator begin,

InputIterator end,

outputIterator Result)

返回的结果为：OutputIterator容器的Result到Result+（end-begin）位置被InputIterator
容器begin到end位置的数据覆盖。[begin,end)

#include
<vector>

#include
<algorithm>

#include
<iostream>

using  namespace std;

void main()

{

vector<int> vec1,vec2;

for(int i=0;i<=5;++i)

{

vec1.push_back(i*2);

}

for(int i=0;i<=10;++i)

{

vec2.push_back(i*3);

}

cout<<"vec1 数据项依次为：";

for(vector<int>::iterator iter=vec1.begin();iter!=vec1.end();iter++)

{

cout<<*iter<<"   ";

}

cout<<endl<<"vec2的数据项依次为：";

for(vector<int>::iterator iter=vec2.begin();iter!=vec2.end();iter++)

{

cout<<*iter<<"   ";

}

//copy,更新vec2的数据，

copy(vec1.begin(),vec1.end(),vec2.begin());

cout<<endl<<"更新后的vec2：";

for(vector<int>::iterator iter=vec2.begin();iter!=vec2.end();iter++)

{

cout<<*iter<<"   ";

}

system("pause");

}

abs: 数据的绝对值

#include
<iostream>

#include
<valarray>

using namespace std;

const int  nums=10;

void main()

{

//集合应用

valarray<int> val_old(nums);

for(int i=0;i<nums;++i)

{

val_old[i]=-i;

}

cout<<"the size of val_old 
is :"<<val_old.size()<<endl;

cout<<"before abs list is: ";

for(int i=0;i<nums;++i)

{

cout<<val_old[i];

if(i<nums-1)

{

cout<<",";

}

}

valarray<int> val_new=abs(val_old);
//将整合集合对象传给方法，每个元素都变

cout<<endl<<"after abs:";

for(int i=0;i<nums;++i)

{

cout<<val_new[i];

if(i<nums-1)

{

cout<<",";

}

}

//单个对象。

double d=-9.909;

double abs_d=abs(d);

cout<<endl<<abs_d+d;

system("pause");

}

 

includes:标头: <algorithm>

函数原型：bool includes(

InputIterator1 First1,

InputIterator1 Last1,

InputIterator2 First2,

InputIterator2 Last2

)

集合序列与集合序列之间的包含与否！

#include
<iostream>

#include
<algorithm>

#include
<functional>

#include
<string>

#include
<deque>

using namespace std;

int main()

{

deque<string>::size_type nums=5;

deque<string> strs_big(nums);

deque<string> strs_small(3);

strs_big.push_back("one");

strs_big.push_back("two");

strs_big.push_back("three");

strs_big.push_back("four");

strs_big.push_back("");

strs_small.push_back("");

strs_small.push_back("two");

strs_small.push_back("four");

sort(strs_big.begin(),strs_big.end());

sort(strs_small.begin(),strs_small.end());

cout<<endl<<"较大串的数据元素有：";

for(deque<string>::iterator ite=strs_big.begin();ite!=strs_big.end();++ite)

{

cout<<*ite<<"  ";

}

cout<<endl<<"较小串的数据元素有：";

for(deque<string>::iterator it=strs_small.begin();it!=strs_small.end();++it)

{

cout<<*it<<"  ";

}

if(includes(strs_big.begin(),strs_big.end(),strs_small.begin(),strs_small.end()))

{

cout<<endl<<"大串包含小串！Y";

}

else

{

cout<<endl<<"大串不包含小串！N";

}

system("pause");

}