Chapter 12, Problem 9PC

Program Plan Intro

Case Manipulator

Program plan:

• Include the required header files to the program.
• Declare the constant variable.
• Declare function prototypes which are used in the program.
• Define the “main()” function.
  • Declare the required variables.
  • Get the input C-string from the user.
  • Copy the string 1 to string 2 and string 3.
  • Call the “upper ()” function and display the result.
  • Call the “lower ()” function and display the result.
  • Call the “flip ()” function and display the result.
• Define the “upper ()” function.
  • Check the string not equal to zero.
    • If the letter is not an uppercase, change the letters into uppercase using “toupper” function.
• Define the “lower ()” function.
  • Check the string not equal to zero.
    • If the letter is not a lowercase, change the letters into lowercase using “tolower” function.
• Define the “flip ()” function.
  • Check the string not equal to zero.
    • If the letter is not an uppercase, change the letters into uppercase using “toupper” function.
    • Otherwise, if the letter is not a lowercase, change the letters into lowercase using “tolower” function.