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 }
2、请画出上述程序的控制流图,并计算其环路复杂度VG.。
正确答案及解析
正确答案
解析
控制流图
环路复杂度V(G)=11
【解析】
第二小题考查白盒测试用例设计方法之基本路径法。
涉及到的知识点包括根据代码绘制控制流图、计算环路复杂度。
控制流图是描述程序控制流的一种图示方式,它由节点和定向边构成。控制流图的节点代表一个基本块,定向边代表控制流的方向。其中要特别注意的是,如果判断中的条件表达式是复合条件,即条件表达式是由一个或多个逻辑运算符连接的逻辑表达式,则需要改变复合条件的判断为一系列之单个条件的嵌套判断。本题程序中,if(month>=1 && month<=12)这条判断语句中的判定由两个条件组成,因此在画控制流图的时候需要拆开成两条判断语句。同理,if(month==4||month=6||month==9||month=11)这条判断语句中的判定由4个条件组成,因此在画控制流图的时候需要拆开成4条判断语句。这里需要注意的是,如果复合条件之间是"&&"的关系,则拆开后反应在控制流图上是沿左子树往下,反之如果条件之间是"||"的关系,则在控制流图上是沿右子树往下。
程序的环路复杂度等于控制流图中判定节点的个数加1,本题控制流图中判定节点个数为10,所以V(G)=11。
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