what is a constant variable

A constant variable is a term used in science to refer to something that is kept the same during an experiment, also known as a control variable. In programming, a constant is a value that cannot be altered during normal execution, while a variable is an identifier with a value that can be changed during normal execution. In C++, a constant variable is one whose value cannot be updated or altered anywhere in the program and must be initialized at its declaration. In mathematics, a constant variable is a variable that has a constant value, meaning that its value does not change. The main difference between a constant and a variable is that a constant is a fixed value that does not change over time, while a variable is a term that can change or vary over time. In summary, a constant variable is a term used in science, while a constant is a term used in programming and mathematics.