Strings

• Strings are arrays of characters in C++
• See the program flipper.cpp for an example of string manipulation
• The program takes the string s1 as input, sends it to a function called flip to reverse it. Outputs the original and reversed string
• To start with we only wrote the driver program and the function flip was written as a stub
• A stub is a function with some trivial output statement in the body of the program
• Writing drivers and testing them with stubs allows us to make sure that the skeleton of the program is properly written and free of errors
• After the driver with stubs is tested, we go ahead and add the body of the stubs
• Note that the function flip has two parameters
  • both are arrays of characters
  • source is passed as const to make sure that the source is not inadvertantly changed. The compiler will report an error message if you try
• Another new feature we looked at was declaration of variables in the middle of a function.
• Sometimes it is a good practice to declare variables just before they are used. See variable s2 in flipper.cpp.