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c++ zigzag pattern setw

Hello, i'm stuck ones again.... the code should generate a zigzag something like this

Please enter the maximum field width: 9
Enter the microseconds to pause between asterisks: 50000
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
^C
my code below kinds of works but i don't know what i'm doing wrong any help would be great thanks

#include <iostream>
#include <cstdlib>
#include <iomanip>
using namespace std;

int main(void)
{

  int width;
  int interval;
  cout <<"Please enter the maximum field width: ";
  cin>> width;
  cout <<"Enter the micrososeconds to pause between asterisks: ";
  cin >> interval;

int n =1;

while (n <=width)
{
   cout <<(setw(n)) << "*" <<endl;
   n++;

}

while (true)

{

for(n =1; n<=width; n++)
cout << setw(n) <<"*" <<endl;

for(n=width; n > 1; n--)
cout << setw(n) <<"*" <<endl;
usleep(interval);


}

}

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