Program Debugging

Tom Kelliher, CS17

Feb. 23, 1996

Types of errors:

• Syntax errors
• Warning Diagnostics
• Run-Time errors
• Design/logic errors

The Turbo C++ Debugger

Easy-to-use, convenient debugging environment

Single-Stepping Vs. Running

• Step over
• Trace into
• Run from beginning, current statement
• Program reset

Breakpoints

• What are they?
• Toggling

Watches

• Scope
• Watch list

Evaluate/Modify

• Just another way of viewing variables?
• Modifying variables

Lab Exercise

Using the given program:

1. Remove any syntax and/or other errors which prevent the program from compiling
2. Run the program with several different inputs. Do there appear to be any run-time or design errors? (There should be a few.)
3. Use the debugger to single step the program, set and use breakpoints, set some watches, and modify some variables
4. Fix the program so that it runs correctly