array-08.c

#include <stdio.h>
#include <stdlib.h>

void main(void)
{
    int Upper[5][5] = { 3, 9, 1, 4, 7,
                        0, 5, 2, 5, 8,
                        0, 0, 5, 6, 4,
                        0, 0, 0, 1, 7,
                        0, 0, 0, 0, 9 };
    int RowMajor[15];
    int Index;
    int i, j;

    printf("Two Dimensional upper triangle array:\n");

    for(i = 0; i < 5; i++)
    {
        for(j = 0; j < 5; j++)
           printf("%3d", Upper[i][j]);
        printf("\n");
    }

    for(i = 0; i < 5; i++)
        for(j = 0; j < 5; j++)
           if(i <= j)
            {
                Index = (11 - i) * i/2 + (j - i);
                RowMajor[Index] = Upper[i][j];
            }
        printf("\n");

    printf("Row Major one dimensional array:\n");
    for(i= 0; i < 15; i++)
        printf("%3d", RowMajor[i]);
    printf("\n");
}