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what is cyclomatic complexity? plz explain with example
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Answer Posted / deep singh kushwaha
Cyclomatic complexity is a software metric (measurement) developed by Thomas McCabe and is used to measure the complexity of a program. It directly measures the number of linearly independent paths through a program's source code.
One of the ways is counting the number of closed loops in the flow graph, and incrementing the number by one.
i.e.
M = Number of closed loops + 1
where
M = Cyclomatic number.
Implications for Software Testing
M is a lower bound for the number of possible paths through the control flow graph.
M is an upper bound for the number of test cases that are necessary to achieve a complete branch coverage.
For example, consider a program that consists of two sequential if-then-else statements.
if (c1) {
f1();
} else {
f2();
}
if (c2) {
f3();
} else {
f4();
}
To achieve a complete branch coverage, two test cases are sufficient here.
For a complete path coverage, four test cases are necessary.
The cyclomatic number M is three, falling in the range between these two values, as it does for any program.
please suggest me if i m wrong..
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