Write a program to enter any Number and check whether it is negative or positive..
plz tell me friends....
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Explanation:
function isPositive(num) {
// if something is true return true; else return false is redundant.
return num >= 0;
}
// when you want to keep doing something until a condition is met,
// particularly with user input, consider a while(true) loop:
var num;
while (true) {
num = prompt("Enter a number");
// check for null here
if (num === null) {
alert("No number entered. Try again.");
continue; // return to the start of the loop
}
num = parseInt(num, 10); // second argument is NOT optional
if (isNaN(num)) {
alert("Invalid number entered. Try again.");
continue;
}
// once we have a valid result...
break;
}
// the loop will continue forever until the `break` is reached. Once here...
alert(isPositive(num));
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