Eventually the code will be totally double precision. In some cases floating numbers naturally will have names beginning with one of the letters reserved for integers. In this case a lower case x is used as the first character. Examples include xJumpDown, xMoleDen. Examples are chName or chReadInput.
Examples are lgOK, lgDone.
These are of intrinsic type int. Structure names Variables with a common purpose are grouped together into structures. For instance the electron density variable eden is an element of the structure phycon with the name phycon.eden. This is where eden is defined since its full name is phycon.eden. The format of braces consumes a staggering amount of debate but is important since the format must be followed consistently across the code for it to be instantly legible.