loops

[caster5]

hello, I'm trying to figure out loops and so far, I think I'm being very inefficient.

I'm trying to output this.

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

This is the code I have, but looks terrible to me. Any help or guidance would be appreciated, thank you for your time.

#include <iostream>
using namespace std;
int main()
{
 int i =5;
 
while (i!=13)
{
      cout<<i<<" ";
      i+=2;
      }
      i=10;
      while(i!=2)
      {
                 cout <<i<<" ";
                 i-=2;
                 }
      cout<<endl;
 
 i=3;
 while(i!=12)
 {
             cout<<i<<" ";
             i+=3;
             }
             i=8;
             while(i!=-1)
             {
             cout<<i<<" "; 
             i-=3;
             } 
      cout<<endl;   
  
  i=2;
 while(i!=10)
 {
             cout<<i<<" ";
             i+=4;
             }
             i=5;
             while(i!=-3)
             {
             cout<<i<<" "; 
             i-=4;
             }  
      cout<<endl;  
 system("pause");   
 return 0;
}

[Jikax]

I did this:

#include <iostream>

using namespace std;

int main()
{
	int i= 5;
	signed int c= 2;
	int max = 11;

	cout << "start" << endl;
	
	while(i!=1)
	{
		for(int j=0;j<2;j++)
		{
			for(int k=0;( (k<4) && (i<=max) && (i>=1) ) ;k++)
			{
				cout << i << "\t";
				i+=c;
			}
			i-=c;
			i -= (i>2) ? 1 : 0;
			c*=-1;
		}
		max--;
		c++;
		cout << endl;
	}

	getchar();

	return 0;
}