How to generate following series in C++ : -1 1 -1 1 -1 1

Question

I want to generate the following series in C language, please help.

1
2 3
3 4 5
4 5 6 7
5 6 7 8 9
6 7 8 9 10 11

Answer 1

#include<iostream.h>
main()
{
    int i,count=0;
    for(i=0;i<10;i++)
    {
        if(count==0)
        {
            cout<<'-1 ';
            count=1;
        }
        if(count==1)
        {
            cout<<'1 ';
            count=0;
        }
    }         
}