I a trying to create a calculator in android app.. the delete button does not work proper, which part of my code is worng

Question

onEvent("backBtn", "click", function(event) {
console.log("Delete button clicked");
click += 1;
if(click === 1){
inputTwo = " ";
setText("inputdisplay", inputOne + inputTwo);
}else if(click === 2){
inputOne = " ";
firstInput = true;
setText("inputdisplay", inputOne + inputTwo);
click = 0;
}
});

Answer 1

which is initial value of click?