Operation of WPP[edit] WPP is run prior to compilation (in other words, before even the C preprocessor), and generates a trace message header for each file that it processes (by default this header is filename.tmh, where filename is the name of the processed source file). WPP's understanding of C/C++ syntax is very limited.
Divide the new value by the old value and multiply by 100 to find the absolute relationship between the two values. A process that is similar (but not identical) to the process used to find percent change is that used to find the absolute percentage relationship between the old and new values.
How to calculate percent difference? Let's use 20 and 30 as an example. We will need to divide the absolute difference by the average of those two numbers and express it as percentages. find the absolute difference between the two: |20 - 30| = |-10| = 10. find the average of those two numbers: (20 + 30) / 2 = 50 / 2 = 25. divide those two: 10 / 25 = 0.4. express it as percentages: 0.4 * 100 = 40%. ... or use the percentage difference calculator :-)