Reverse Triangle | Pattern | Programming in C

#include <stdio.h>
#include <math.h>
#include <conio.h>

main()
{
    int h, r, c;
    clrscr();

    printf("\n Enter the height of the triangle: ");
    scanf("%d", &h);

    for (r = 1; r <= h; r++)
    {
        printf("\n");
        for (c = 1; c <= 40 - r; c++)
            printf(" ");
        for (c = r; c >= 1; c--)
            printf("%d", c);
    }
    getch();
}