C program for left hand side right angle triangle

-------------------------------------------------------Program--------------------------------------------------

#include<stdio.h>
#include<conio.h>
main()
{
    int r,c,n,at;
    printf("Enter the numbers of row: ");
    scanf("%d",&n);
    for(r=1;r<=n;r++)
    {
        for(c=(n-r);c>=1;c--)
        {
            printf(" ");
        }
        for(at=1;at<=r;at++)
            printf("%d",at);
        printf("\n");
    }
    getch();

}