/*Terrain Navigation Excercise*/
/*page 250*/

#include<stdio.h>
#define N 25
#define FILENAME "grid1.txt"

int main(void)
{
    int nrows, ncols, i, j;
    double elevation[N][N];
    FILE * grid;

    grid = fopen(FILENAME,"r");

    if(grid == NULL)
    {
        printf("Error\n");
    }
    else
    {
        fscanf(grid,"%d %d",&nrows,&ncols);
        for(i=0;i<=nrows-1;i++)
        {
            for(j=0;j<=ncols-1;j++)
            {
                fscanf(grid,"%lf",&elevation[i][j]);
            }
        }

        for(i=0;i<=nrows-2;i++)
        {
            for(j=0;j<=ncols-2;j++)
            {
                if((elevation[i-1][j] < elevation[i][j])
                && (elevation[i+1][j] < elevation[i][j])
                && (elevation[i][j-1] < elevation[i][j])
                && (elevation[i][j+1] < elevation[i][j]))
                {
                    printf("Peak at row %d, col %d \n",i,j);
                }
            }
        }

        fclose(grid);
    }

    return 0;
}