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JavaScript

I'm not sure if this is right but It seems to be working fine

// declare program variables
var message = "<h1>Math with the numbers " + num1 + " and " + num2 + "</h1>";
var num1 = prompt("Please type a number");
num1 = parseFloat(num1);
var num2 = prompt("Please type another number");
num2 = parseFloat(num2);

if(num2 === 0 ){
  alert("The second number is 0. You can't divide by 0. Reload and try again.")
} else if(isNaN(num1,num2)) {
  alert("At least one of the values you typed is not a number. Reload and try again.")
}

// announce the program
alert("Let's do some math!");

// collect numeric input


// build an HTML message
message += num1 + " + " + num2 + " = " + (num1 + num2);
message += "<br>";
message += num1 + " * " + num2 + " = " + (num1 * num2);
message += "<br>";
message += num1 + " / " + num2 + " = " + (num1 / num2);
message += "<br>";
message += num1 + " - " + num2 + " = " + (num1 - num2);

// write message to web page
document.write(message);