Using the Keyboard with a Web Page Calculator

Details of the operator(ID) Function

This function uses three global variables. These variables are:

//argument for top level JavaScript eval() function

var evalString = ""

//the memory (store) is a variable

var memVar = "";

//after the operation +, -, X and /, the display has to be cleared. We need for this the variable

var toClearDisplay = false;

I talked about these variables before. It suffices here to read the comments. I will come back to the global variables after I explain the operator() function. The operator function has two code segments.