Requirements for Variables
Requirements for variables include the items listed.
Minimum use of global variables.
Any modules that use global variables must be identified.
The input and output variables associated with each function should be identified in comment code at the start of each function.
All variables should be explicitly declared and given an initial value.
Hierarchial data structures should be used to keep the data and program structured.
Variable names should be meaningful.
Variable names should be in lower case.
Use simple incrementer variables for loops counters such as the Fortran integer variable names which are i, j, k, l, m, and n.
In graphics or coordinates, use variables x, y, and z for coordinates.