#include <stdio.h>
void printPattern(int n,int maxN);
int main()
{
    int n;
    printf("Enter the Number of asterisks: ");
    scanf("%d",&n);
    if(n < 1)
    {
        printf("error! the number of lines can\'t be negative");
        return 1;
    }
    int numberOfLines = 2*n-1;
    printPattern(numberOfLines,n);
    return 0;
}
void printPattern(int n,int maxN)
{
    if (n >= maxN)
    {
        for(int i = n ; i < 2*maxN; i++ )
        {
            printf("*");
        }
        printf("\n");
        printPattern(n-1,maxN);
    }
    else if(n >= 1)
    {
        for(int i = n;i >=1 ; i--)
        {
            printf("*");
        }
        printf("\n");
        printPattern(n-1,maxN);
    }
    return;

}