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AC16 Software Engineering 
 
 79 
Test # Description Test Data 
1 A valid scalene triangle. a = 2, b = 3, c = 4 
2 An illegal triangle with a zero length side. a = 0, b = 1, c = 1 
3 An illegal triangle with one short side. a = 1, b = 4, c = 2 
4 A valid equilateral triangle. a = 1, b = 1, c = 1 
5 A valid isosceles triangle. a = 1, b = 2, c = 2 
 
Q.14 Consider a program which computes the square root of an input integer 
between 0 and 5000. Determine the equivalence class test cases. 
Determine the test cases using boundary value analysis also. 
 
Ans. For a program that computes the square root of an input integer which can 
assume values in the range of 0 to 5000, there are three equivalence classes: The set 
of negative integers, the set of integers in the range of 0 and 5000, and the integers 
larger than 5000. Therefore, the test cases must include representatives for each of the 
three equivalence classes and a possible test set can be: {-5,500,6000}. 
Boundary value analysis leads to selection of test cases at the boundaries of the 
different equivalence classes. For a function that computes the square root of integer 
values in the range of 0 and 5000, the test cases must include the following values: {0, 
-1,5000,5001}. 
 
Q.15 For the structural chart given in fig.1 calculate the Information Flow index of 
 individual modules as well as whole software. 
 
 
 Ans: 
Module Fan-in Fan-out 
Information Flow index of 
module(Fan-in*Fan-out)
2 
main 2 2 16 
A 2 2 16 
B 2 2 16 
C 2 1 4 
l 0 1 0 
m 1 1 1 
n 0 1 0 
x 1 1 1 
AC16 Software Engineering 
 
 80 
y 1 0 0 
 
 Total information flow = IF (main) + IF (A) + IF (B) + IF (C) + IF (I) + IF (m) 
 + IF (n) + IF (x) + IF (y) 
 = 16 + 16 + 16 + 4 + 0 + 1 + 0 + 1 + 0 
 = 54 
 
Q.16 For the flow graph shown in Fig2, compute McCabe’s Cyclomatic Complexity. 
 
 
Ans:In this flow graph, Number of regions are 5, hence the Cyclomatic complexity is 
= 5 
OR 
No of edges = 10 
No of nodes (N) = 7 
Hence Cyclomatic complexity + E-N+2 = 10-7+2 = 5 
 
Q 17 Write a program in C to add two numbers and then calculate the values of the 
following software science metrics : 
(i) n(vocabulary of a program ) 
(ii) N (program length) 
(iii)V(Volume) 
(iv) L(program level) 
 
 Ans Void Main() 
 { int i,j,sum 
 scanf(“%d%d”,i,j); 
 sum = i+j; 
printf(“%d” ,sum);} 
 
operators occurrences operands occurrences 
main() 1 
 i 2