用PDL语言描述的averagy过程如下

用PDL语言描述的averagy过程如下：

PROCEDURE averagy

*This procedure computes the average of 100 or fewer numbers that lie bounding values; it also computes the total input and the total valid.

INTERFACE RETURENS averagy, total.input, total.valid;

INTERFACE ACCEPTS value, minimum, maximum;

TYPE value[1:100] IS SCALAR ARRAY;

TYPE averagy, total.input, total.valid, minmum, maximum, sum IS SCALAR;

TYPE i IS INTEGER;

1. i=1;

2. total.input =total.valid=0;

3. sum=0;

4. DO WHILE value [i]<>-999 AND value[i]<=maximum

5. increment total.input by 1;

6. IF value[i]>=minmum AND value[i]<=maximum

7. THEN increment total.valid by 1;

8. sum=sum+value[i];

9. ELSE skip;

10. ENDIF;

11. increment i by 1;

12. ENDDO

13. IF total.valid>0

14. THEN averagy=sum/total.valid;

15. ELSE averagy=-999;

16. ENDIF

17. END averagy

第1步：以详细设计或源代码作为基础，导出程序的控制流图。

?第2步：计算得到控制流图G的环路复杂性V（G）。

?V（G）＝6（区域数）＝5（判定节点数）＋1＝6

?第3步：确定线性无关路径的基本集

?Path1:1-2-10-11-13

?Path2:1-2-10-12-13

?Path3:1-2-3-10-11-13

?Path4:1-2-3-4-5-8-9-2-10-11-13

?Path5:1-2-3-4-5-6-8-9-2-10-11-13

?Path6:1-2-3-4-5-6-7-8-9-210-11-13

?第4步：生成测试用例，确保基本路径集中每条路径的执行。