What is the 'Control break value'?
I think it should be declared before the first usage.
pointer is the variable that holds the address of another variable
In an experiment, your control variable will not be caused to vary by the experiment. Think of 'cause and effect'. The independent variable is the cause, the result is the effect, and the dependent variable is the one that you leave to be changed by the experiment.
A pointer is used for pointing to a variable. It contains the address of the variable to which it points
pointer variable B holds base address of B
$_SERVER is a PHP super global variable which holds information about headers, paths, and script locations.
A variable is a memory address that holds a value. A constant is simply a variable that does not change value.
An independant variable should always be on the x-axis of a graph and the dependant variable on the y-axis.
The constant variable is the one that does not change. The one that holds the same. It is also called the controlled variable an example will be that if you have bucket that you put cement on it and put something after it dried you can't change it.
Jiffies is a global variable that holds the number of ticks that have occured after the system has booted. On each timer interrupt the value of this variable is increased by 1.
Any variable, which holds a value that represent the state of something, like: int door_is_open; /* 0/1 = closed/opened */
Variable names should show what data the variable holds so others reading your code will understand it. For example, a variable holding the age of a user should be called "age" or "user_age", or something similar.
There are two schools of thought as to who is in control in regards to stock brokerages. One holds that the client is in control while the other holds that the broker is in control. Often it is a cooperative effort of the two.