• Announce
  • Quiz Postponed to Monday

• Look at numtoeng.cpp in Book

• The string Member Functions
  string demo = "Monday morning";
  • Length: int length()
demo.length() == 14
  • Substring: string substr(int pos, int len)
demo.substr(7,4) == "morn"
  • Find: int find(string s)
demo.find("y m") == 5 (not found: string::npos )

• Member Function vs Free Function
  • int length() is member function of string class
  • int sqrt(int) is not part of any class

• String Example: Yes of No Response
  • What can go wrong when expecting a yes/no response?
  • Look at yesOrNo.cpp
  • What is not tested by this example main()?
  • What is a more practical way to use this function?

• Preconditions and Postconditions for Functions

Chapt 5. Iteration with Programs and Classes

• Iteration (pre-tested)
  • initialization
  • loop test
  • loop body
  • update

• while Loop Syntax

while ( test expression )
{
statement list
}

• While Example blastoff.cpp

• Diamonds are for Fun diamonds.cpp

• More Looping: Math Tables
  formerly got PhD for better tables
  pow1.cpp
pow2.cpp
  
  
  
  

• for Loop Syntax

for ( initialization; test expression; update )
{
statement list
}

• Pre-tested and Post-tested Loops

• Iteration (post-tested)
  • initialization
  • loop body
  • update
  • loop test

• do-while Loop Syntax

do
{
statement list
}
while ( test expression )