软件测试 | assignment4

Operator	Number of Occurrences
if	1
<	1
+=	1
–	1
int	1
+	6
*	2
/	4
%	1
dayray	1
return	1
n1 = 11	N1 = 20

Operand	Number of Occurrences
month	3
3	1
12	1
year	5
day	1
1	1
26	1
10	1
4	1
6	1
100	1
400	1
7	1
n2 = 13	N2 = 19

Halstead Metrics

• $n_1=11,n_2=13,N_1=20,N_2=19$
• 程序词汇表长度 Program vocabulary: $n=n_1+n_2=24$
• 程序长度或简单长度 Program length: $N=N_1+N_2=39$
• 程序的预测长度 Calculated program length:N^ =$n_{1}lo{g}_2{n}_1+n_{2}lo{g}_2{n}_2=86.15946$
• 程序体积或容量 Program volume: $V=Nlo{g}_2(n)=178.81$
• 程序级别Program level: L^ $=(2/n_1)\ast (n_2/N_2)=2/11\ast 13/19=0.124$
• 程序难度Program difficulty: $D=1/$L^ $=8.03846$
• 编程工作量 Effort: $E=V\ast D=V/$L^ = $1437.357$
• 语言级别: Lʹ = L^ * L^ * V = $2.74938256$
• 编程时间 (hours): T^ = $E/(S\ast f)=E/(60\ast 60\ast 18)=0.02218$
• 平均语句大小: $N/语句数=39/4=9.75$
• 程序中的错误数预测值: $B=V/3000=Nlo{g}_2(n)/3000=0.0596$