https://www.facebook.com/photo.php?fbid=636756883089269&set=

#include <stdio.h>
#include <string.h>
int main (void)
{
    char tree[9][12];
    memset(tree, ' ', 9*11 - 1);
    int r, c;
    for (r = 0; r < 6; tree[r][11] = '\n', r++)
        memset(&tree[r][5-r], '*', 2*r + 1);
    for (r = 6; r < 9; tree[r][11] = '\n', r++)
        memset(&tree[r][(11-7) / 2], '*', 7);
    tree[8][11] = '\0';

    printf("Enter row number: ");
    scanf("%d", &r);
    printf("Enter column number: ");
    scanf("%d", &c);
    char ch;
    printf("Enter character: ");
    scanf(" %c", &ch);

    r--, c--;
    if (tree[r][c] == '*')
        tree[r][c] = ch;
    else
        printf("Error: (%d,%d) is out of bounds\n", r, c);

    printf((char *)tree);

    return 0;
}