Create a simple program that repeatedly asks the user for a length, stopping only when a negative length is entered. For each non-negative number, the program draws a two-headed arrow of that length. The arrow starts with a less-than sign ( ). In between are as many hyphens as the length of the arrow. For example: Enter a length: 5 Enter a length: 1 Enter a length: 12 ---> Enter a length: -1