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star pattern-7 in c language

for n=3


         0       
      1 0 1
   2 1 0 1 2
3 2 1 0 1 2 3


code is below:



#include <stdio.h>
#include <string.h>
#include <math.h>
#include <ctype.h>
#include <stdlib.h>
int main()
{
    int num, k;
    printf("Enter the number\n");
    scanf("%d", &num);
    for (int i = 1; i <= num + 1; i++)
    {
        k = i;
        for (int j = 1; j <= num * 2 + 1; j++)
        {

            if (j <= num + 1)
            {
                if (j >= num + 2 - i && j <= num + i)
                {
                    k--;
                    printf("%d", k);
                }
                else
                {
                    printf(" ");
                }
            }
            else
            {

                if (j >= num + 2 - i && j <= num + i)
                {
                    k++;
                    printf("%d", k);
                }
                else
                {
                    printf(" ");
                }
            }
        }
        printf("\n");
    }

    return 0;
}
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