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");
}
