ProjectCodeMeter

## Halstead complexity measures

[article cited from Wikipedia]

**Halstead complexity measures**
are software metrics introduced by Maurice Howard Halstead in 1977.
These metrics are computed statically, without program execution.

### Calculation

First we need to compute the following numbers, given the program source code:

*n*1 = the number of distinct operators*n*2 = the number of distinct operands*N*1 = the total number of operators*N*2 = the total number of operands

From these numbers, five measures can be calculated:

- Program length:
- Program vocabulary:
- Volume:
- Difficulty :
- Effort:

The difficulty measure is related to the difficulty of the program to write or understand, e.g. when doing code review.