i am getting error in following program. what is "iota". Why it is giving an error in the following program
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
vector<int> V(10);
iota(V.begin(), V.end(), 7);
copy(V.begin(), V.end(), ostream_iterator<int>(cout, " "));
cout << endl;
cin.get();
}
You forgot to #include <numeric>
#include<iostream>
#include<vector>
#include<deque>
#include<list>
#include<algorithm>
#include<functional>
#include<conio.h>
using namespace std;
int main()
{
vector<int> V1; //vector container for integer elements
deque<int> V2; //dequeu container for integer elements
list<int> V3; //list container for integer elements
vector<int>::iterator pos1; // declaration of iterator
deque<int>::iterator pos2; // declaration of iterator
list<int>::iterator pos3; // declaration of iterator
//append elements from 12 to 18 in Vector container V1
for(int i=12;i<=18;++i)
{
V1.push_back(i); //inserts an element at the back of the collection
}
/*print all elements of V1
* - iterate over all elements */
cout<<"V1: ";
for(pos1=V1.begin();pos1!=V1.end();++pos1)
{
cout<<*pos1<<' ';
}
cout<<endl;
//append elements from 2 to 8 in deque container V2
for(int i=2;i<=8;++i)
{
V2.push_front(i); //inserts an element at the front of the collection
}
/*print all elements of V2
* - iterate over all elements */
cout<<"V2: ";
for(pos2=V2.begin();pos2!=V2.end();++pos2)
{
cout<<*pos2<<' '<<' ';
}
cout<<endl;
int ch;
do
{
cout<<"Select your option\n1.Add\n2.Subtract"<<endl;
cin>>ch;
switch(ch)
{
case 1:
//transform resulted element to list V3 after addition of each element in vector V1 and deque V2
// - Add transformed values
transform(V1.begin(), V1.end(), //First sorce range
V2.begin(), //Second source range
back_inserter(V3), //destination
plus<int>()); //operation
//dispaly the resulted output
cout<<"V1+V2:"<<endl
;
for(pos3=V3.begin();pos3!=V3.end();++pos3)
{
cout<<*pos3<<' ';
}
/*V3.~list<int>();*/
V3.clear();
cout<<endl;
break;
case 2:
//transform resulted element to list V3 after addition of each element in vector V1 and deque V2
// - Add transformed values
transform(V1.begin(), V1.end(), //First sorce range
V2.begin(), //Second source range
back_inserter(V3), //destination
minus<int>()); //operation
/* transform (V1.begin(),V1.end(),
back_inserter(V3),
bind2nd (minus<int>(),5)
);*/
//dispaly the resulted output
cout<<"V1-V2:"<<endl;
for(pos3=V3.begin();pos3!=V3.end();++pos3)
{
cout<<*pos3<<' ';
}
/*V3.~list<int>();*/
V3.clear();
cout<<endl;
break;
default:cout<<"You entered wrong option"<<endl;
break;
}
printf("\nDo you wish to continue[y/n]\n");
ch=(char)getche();
}while(ch=='Y' || ch=='y');
cin.get();
}How to replace c code of "ch=(char)getche();" into c++ code.
cin >> ch; :-/
> You forgot to #include <numeric> Edward isn't aware of an iota() function in the numeric header, or in the standard library at all. Is that new to C++ 0x?
Edward isn't aware of an iota() function in the numeric header, or in the standard library at all. Is that new to C++ 0x?
From the numeric-header:
#if _HAS_TRADITIONAL_STL
template<class _FwdIt,
class _Ty> inline
void iota(_FwdIt _First, _FwdIt _Last, _Ty _Val)
{ // compute increasing sequence into [_First, _Last)
_DEBUG_RANGE(_First, _Last);
for (; _First != _Last; ++_First, ++_Val)
*_First = _Val;
}
#endif /* _HAS_TRADITIONAL_STL */This function is an SGI extension; it is not part of the C++ standard.
And according to my research (haven't worked with this header) is was original from the algo.h - header
I see, thanks! :)
Holy cow! Did I just teach Edward something she didn't know?
That makes my day! :)
There are a lot of things that Edward doesn't know, or forgot, or isn't smart enough to understand. ;)
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