阅读下列C程序，回答下列问题。
[C程序] int GetMaxDay( int year, intmonth ) { int maxday = 0; //1 if ( month ＞= 1 && month ＜= 12 ) { //2,3 if ( month == 2 ) { //4 if ( year % 4 == 0 ) { //5 if ( year % 100 == 0 ) { //6 if ( year % 400 == 0 ) } //7 maxday = 29; //8 else //9 maxday = 28; } else //10 maxday = 29; } else //11 maxday = 28; } else{ //12 if(month==4||month==6||month==9||month==11) //13, 14, 15, 16 maxday = 30; //17 else //18 maxday = 31; } } return maxday; //19 }
3、请给出问题2中控制流图的线性无关路径。
正确答案及解析
正确答案
解析
线性无关路径：
1．1-2-19
2．1-2-3-19
3．1-2-3-4-12-13-14-15-16-18-19
4．1-2-3-4-12-13-14-15-16-17-19
5．1-2-3-4-12-13-14-15-17-19
6．1-2-3-4-12-13-14-17-19
7．1-2-3-4-12-13-17-19
8．1-2-3-4-5-11-19
9．1-2-3-4-5-6-10-19
10．1-2-3-4-5-6-7-9-19
11．1-2-3-4-5-6-7-8-19
【解析】
第三小题考查白盒测试用例设计方法中的基本路径法。
涉及到的知识点是根据控制流图和环路复杂度给出线性无关路径。
线性无关路径是指包含一组以前没有处理的语句或条件的路径。从控制流图上来看，一条线性无关路径是至少包含一条在其他线性无关路径中从未有过的边的路径。程序的环路复杂度等于线性无关路径的条数，所以本题中应该有11条线性无关路径。
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