In Python, the code is pretty easy and a single line one on Jupyter Platform.

As far as C is concerned, the algorithm goes somewhat like this. You need a Do While Loop

With the Function

k=0;

do

{

z=10*k+1

k=z

print z

}

while (z<=1111)

I guess this will work. Of course you may use While Loop or For Loop Instead. I believe use the appropriate Print function with /d for printing in different line.