Pattern00045.c

/*

    *
   * *
  * * *
 * * * *
* * * * *

*/

#include <stdio.h>
int main()
{
    int i, k, flag = 1, row = 0;
    printf("Enter number of line: ");
    scanf("%d", &row);
    for (i = 1, k = 0; i <= 2 * row - 1; i++)
    {
        if (i < row - k)
            printf(" ");
        else
        {
            if (flag)
                printf("*");
            else
                printf(" ");
            flag = 1 - flag;
        }
        if (i == row + k)
        {
            k++;
            printf("\n");
            if (i == 2 * row - 1)
                break;
            i = 0;
            flag = 1;
        }
    }
    return 0;
}