Below are four faulty programs. Each includes a test case that results in failure. Answer the following questions (in the next slide) about each program.
第一个程序是循环遍历没有遍历到x[0]
第二个程序要求找到最后一个0，但该程序只是找到了第一个0
If possible, identify a test case that does not execute the fault. (Reachability)
第一个程序的测试样例
test ：x = [] y = 0；
第二个程序的测试样例：
Test ：x=[] y= 0;
If possible, identify a test case that executes the fault, but does not result in an error state.
第一个程序测试样例：
x=[2,3,5];y=1
第二个程序的测试样例：
X=[2,3,5];y=1
If possible identify a test case that results in an error, but not a failure.
第一个程序测试样例：
test: x=[2, 3, 5]; y = 2
第二个测试程序样例：
test: x=[0, 1, 0]; y=0