CPSC 320: Week 2

• History and goals of Ada


• More information on Ada (ie documentation, tutorials, links)


• Compilation and the execution model


• More information on compilers


• Language Fundamentals: Program structure, assignment, with and use, primitive types, literals, operators, if and loop statements, text and numeric output


• Language Fundamentals (Continued): Program structure, assignment, with and use, primitive types, literals, operators, if and loop statements, text and numeric output


• Procedures and numeric input


• Notes from last year:
• Review: If and For and floating point - sumup2.adb)
• Notes on the above


• Review: Procedures can change parameters - Sample Program (getput.adb)


• Review: Integer Input and While loop and general loop - sumup3.adb


• sumup4.adb: Boolean variables and operators, elsif


• sumup5.adb: in operator, type Positive


• sumup6.adb: type attributes - first, last


• More on Subtypes, attributes, strong typing, expressions, operators


• Notes on structured statements and booleans.


• Old notes for week 2


• An Ada/Java comparison chart


• Programming Assignment 1


• Reading (continued from last week): these sections discuss the material we are covering this week.
  • Chapter 1: all
  • Chapter 1: sections 1-4
  • Chapter 5: all
  • Chapter 6: all sections except 3 and 6 (which we will cover later)
  • Chapter 7: sections 1-3


• Key Topics for this week and next:
  • Strings:
  • Strings are fixed length and their length cannot be changed
  • Strings are not references
  • Strings are arrays of characters, and they can have slices
  • Procedures can change their parameters - java cannot do this
  • I/O of strings and characters
  • Use get to input a character
  • Use get to input a fixed length string of exact length (skips newlines)
  • Use get_line to input a string of unknown length but shorter than some maximum length (if the string was not completely filled, then the next get_line starts on the next line)
  • More on input
  • Use end_of_line to determine if input is at the end fo a line
  • Use skip_line to move to the next line of input, ignoring anything remaining on a line
  • In interactive programs, EOF returns true when control D or control Z is entered
  • get causes an end error if it reads control D or control Z in an interactive programs or if it attempts to do a read at end of file in a program that reads from a file
  • Use redirection to cause standard input (output) to read from (write to) a file
  • Exceptions
  • Any begin/end block can have an exception clause
  • When an exception occurs, control transfers to the exception clause and then (normally) to the end of the enclosing begin/end block
  • Begin/end block can be added anywhere in a program
  • New exceptions can be declared just like variables
  • Exceptions can be raised as needed
  • Ada has 3 built-in exceptions: constraint_error, data_error, program_error.
  • Other exceptions are defined in packages (eg end_error) and/or by the user (eg too_large)
  
  
• Assignment 1
  
  
• Readings:
  • Exceptions: 2.6, 14.1 - 14.3 (you can skip 14.4)
  • Input/Output: 20.6