Question

Suppose an untested program was determined to contain 640 bugs. Three different testing techniques were applied to test the code. Each testing technique is effective to detect 50% of the bugs that exist before the concerned testing technique is applied. While fixing a bug after the application of a test strategy, there is a 50% chance of creating another bug. How many bugs would exist in the code after the three testing and bug-fix cycles have been carried out?

Answer 1

We can use basic mathematics to solve this,

Given-

Initial bugs 640

final bugs ?

effectiveness of finding bugs 50%

error caused after testing 50%

Solution-

a ) Before 1st testing

Total bugs = 640

Corrected bugs = 50% = 320

Now bugs = 640-320 = 320

Newly formed bugs = 50% = 160

Now bugs = 320+160= 480

b ) Before 2nd testing

Total bugs = 480

Corrected bugs = 50% = 240

Now bugs = 640-320 = 240

Newly formed bugs = 50% = 120

Now bugs = 320+160= 360

c ) Before 3rd testing

Total bugs = 360

Corrected bugs = 50% = 180

Now bugs = 640-320 = 180

Newly formed bugs = 50% = 90

Now bugs = 320+160= 270

Finally total bugs after 3 testings will be 270.

Best Luck...

Answer 2

Answer:120

Step-by-step explanation: