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<!DOCTYPE html>
<html>
<body>

<h1>JavaScript Operators</h1>
<h2>The typeof Operator</h2>

<p>The typeof operator returns the type of a variable, object, function or expression:</p>

// !isNaN(34) // returns true

// integer or float

var v1 = 3.14;

if( typeof v1 === 'number' )
 {
	document.getElementById('demo').innerHTML = " Good ";
 
 }
 
 
 function checkNumber1(x) 
 {

}

function checkNumber2(x) {

// check if the passed value is a number
    if(typeof x == 'number' && !isNaN(x)){
    
        // check if it is integer
        if (Number.isInteger(x)) {
            console.log(`${x} is integer.`);
        }
        else {
            console.log(`${x} is a float value.`);
        }
    
    } else {
        console.log(`${x} is not a number`);
    }
}

function isNegative(num) 
{
  if (typeof num === 'number' && Math.sign(num) === -1) 
  {
    return true;
  }

return false;
}

checkNumber1(44);
 
 checkNumber1(3.4);
 
 
 checkNumber2('hello');
checkNumber2(44);
checkNumber2(3.4);

console.log(isNegative(-5) );
console.log(isNegative(5) );

</script>

</body>
</html>