first off...you're trying to store ji as a integer, and it's not an integer, you would most likely want to store it as a string or char array.
so what you would want to do is write it as string k, then say
k = "j" + i;
I believe that would be the "syntax" the + might or might not be right, I don't have a compiler in front of me.
Also in that case you don't need j as a char, you can just use the character j for real....if that makes sense....
so finally the code should look like this I think
k="j" + i;
you might want to add a new line, or something like that to the end so you get a "string" that has all the items on a new line each.
Another option is to write a string array and store the j# in each item in the array.