The C standard library provides functions for manipulating streams for input and output. Various sources of energy input and output are continuously measured. GPIO pins are software configurable to either an input or an output state. Devices communicate to the world via a set of input and output pins. They typically included instructions that performed a complete input or output operation. The output depends on the polarization of the input. A relation between the input and output wind velocity must be considered. CAPs describe potentially causal connections between input and output. Gate symbols describe the relationship between input and output events. This results in growth in productivity or output per unit of input. Their size is determined by a mass balance between snow input and melt output. Income generated per unit of input increases. For simplicity, assume that the control input formula 35. Some turbines use a different type of generator suited to slower rotational speed input. They will either input effort or flow into a system.