using the int i as output name

Hi,everyone.I would like to ask a question about using the int i as output name , I hope someone could help me . such as for i=1:30; I have a function I would like to put 30 different input using for loop . just like input (i)=xxx ->my program->output (i)=xxxx I would like to have 30 input(some audio files 1.wav 2.wav 3.wav ............) and 30 output , output 1 output 2 output 3......, I have tried output(int i) that's not works , also int2str(i) not working too. could anyone tell me how to do that , thanks a lot .