软件测试技术HW2

Program 1：
(1) Fault: ‘for(int i=x.length-1;i>0;i--)’. It should be “i>=0”.
(2) X=[],y=2.
　　Expected=NullPointerException.
　　Output=NullPointerException
(3) X=[2,3,5],y=3.
　　Expected=1
　　Output=1
(4) X=[1,3,5],y=2.
　　Expected=-1
　　Output=-1

Program 2：
(1) Fault: The for-loop should be:
　　for(int i=x.length-1;i>=0;i--)
(2)It’s impossible.
(3) X=[]
　　Expected=NullPointerException.
　　Output=NullPointerException
(4)x=[0,1,2]
　　Expected=0
　　Output=0

Summery：

fault - a cause of the error (mistake in coding)
error - incorrect state that may lead to failure
failure - deviation of the service from the correct service