p18.cpp

/**
 * C program to print number pattern
 */

#include <stdio.h>

int main()
{
    int N, i, j;

    printf("Enter N: ");
    scanf("%d", &N);

    // First upper half of the pattern
    for(i=N; i>=1; i--)
    {
        // First inner part of upper half
        for(j=N; j>i; j--)
        {
            printf("%d", j);
        }

        // Second inner part of upper half
        for(j=1; j<=(i*2-1); j++)
        {
            printf("%d", i);
        }

        // Third inner part of upper half
        for(j=i+1; j<=N; j++)
        {
            printf("%d", j);
        }

        printf("\n");
    }

    // Second lower half of the pattern
    for(i=1; i<N; i++)
    {
        // First inner part of lower half
        for(j=N; j>i; j--)
        {
            printf("%d", j);
        }

        // Second inner part of lower half
        for(j=1; j<=(i*2-1); j++)
        {
            printf("%d", i+1);
        }

        // Third inner part of lower half
        for(j=i+1; j<=N; j++)
        {
            printf("%d", j);
        }

        printf("\n");
    }

    return 0;
}