• C programming
• Allow the user to enter a string with up to 100 letters.
• The program will display the string:
  • Forward
  • Backward
  • Vertical
  • As a triangle made from the letters of the string
• The program will display the number of letters in the string.
• Once everything above was displayed, the program will ask the user if he or she wishes to enter a different string or quit.

So what I actually want to know is how to create a char that can deal with "String up to 100 letter"?