Program1:

1.fault: the i>0 should be i>=0

2.test: x=null

3.test: x=[2,3,5]; y=5; Expected=2;

4.test: x=[2,3,5]; y=4; Expected=-1;

Program2:

1.fault: for(int i=0; i<x.length; i++) should be for(int i=x.length-1; i>=0; i--)

2.test: x=null

3.test: x=[0] Expected=0;

4.test: x=[0,3,5] Expected=0;