Switch to using do/while and if/else if loops.

Program properly handles number output that is < 0 or > 100.
Program properly handles letters.
Program will not properly handle numbers among 0-100.
Fix for else/if loops.

Program now properly handles good input. Had to move the block of code which handled proper input above the block which handled if something bad (non numbers) was entered.
Remove extra diag lines for good_input.