I have an array of int of size 18, however if I am iterating over a loop that stores factors of 9 in that array i.e it would store 1,3,9 in that array and I want to assign the 4th value to be 0 so that I can print the array until 0 appears and so that it doesn't print garbage values and only prints the first four, how do I do it?

(PLease note that it is a C language code)