C programming help! Loops

If you could do it in code:blocks that would be great.

Also, having trouble in particular with making sure the line doesn't end in O.

Print a square of each character separated by a 0. The size of the square will be read in input. Verify that the input is in the range 11:7), otherwise print "The input must be in the range [1:7)." Hint: Make sure that the line does not finish by a O. Make sure that there is not new line at the end of the last line. For example: Input Result size:5 #O#O#O#O# #O#O#O# #O#O#O#O# 200O#O# #O#O#O#O#