Label the A column by typing SQRT into cell A1. Then put the number 0.5 into cell A2 of your spreadsheet. This will give you . Now use the fill down command so that each cell is the square-root of the cell above. This is like pressing the button on your calculator 100 times, and it is called iteration .
Iteration is one type of loop , which is a very important structure in computer science.
In computer programming, a loop is a sequence of instructions that is repeated until a certain condition is reached. Thus, iteration is a loop which repeats until it has filled-down the required number of times. Try putting 100 into A2. Try putting 2 into A2. Try putting 0 into A2.