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Unformatted text preview: moving breakpoints after any
program statement. You may even set multiple breakpoints, and set or remove
breakpoints when the program execution stops and waits for your further
command at a breakpoint.
2. Watchpoint. Suppose a program contains a variable named "radius" whose
initial value of 5 is not supposed to change during execution of the program or
after some point in the program. But during debugging of the program you
discover that its value is changing and you want to know the exact point in the
program where its value gets changed. In such a situation, you can tell the
debugger that "radius" is a watch variable. That is, you are telling the debugger to
keep track of the variable "radius" and the moment its value changes, stop and
give me control. The debugger will immediately stop after the statement that
causes the value of the variable "radius" to change and will await your further
Both kinds of checkpoints are very helpful in detecting logic errors in programs.
Using Memory Dump
This approach is normally used when the program "hangs up" during a test run. In
this approach, a printout of the contents of main memory and registers is taken at
the time when the program hangs up. This printout is called a memory dump or
storage dump. The memory dump lists the instructions and data held in the
computer's main memory in their raw form, that is, their binary or equivalent
hexadecimal or octal form. The cause of the problem is very likely to be detected
by doing a proper analysis of this listing.
Difference Between Testing and Debugging
Since both testing and debugging deal with program errors, many people often
confuse between these two terms. The discussion above has clearly indicated that
testing and debugging are two separate tasks. The points listed in Figure 13.1
further clarify the difference between the two.
No. 1 2 Testing is the process of
validating the correctness of a
program. Its objective is to
demonstrate that the program
meets its design speci...
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- Spring '14