Homework2_3015218130_许鹏程

program 1 :

Identify the fault.

for (int i=x.length-1; i > 0; i--)

change to:

for (int i=x.length-1; i >= 0; i--)

If possible, identify a test case that does not execute the fault. (Reachability)

text: x=[ ]; y=2

Expected: NullPointerException

If possible, identify a test case that executes the fault, but does not result in an error state.

text: x=[2,3,5]; y=3

Expected= 1

If possible identify a test case that results in an error, but not a failure.

text: x=[2,3,5]; y=6

Expected= -1

program 2:

Identify the fault.

for (int i = 0; i < x.length; i++)

change to:

for (int i =x.length-1;i>=0; i--)

If possible, identify a test case that does not execute the fault. (Reachability)

text: x=[ ];

Expected: NullPointerException

If possible, identify a test case that executes the fault, but does not result in an error state.

text: x=[0,1,1];

Expected= 0

If possible identify a test case that results in an error, but not a failure.

text: x=[1,1,1];

Expected= -1