(JavaScript programming Example for Beginners)
Javascript Program to Check if a number is Positive, Negative, or Zero
In this example, you will learn to check whether the number entered by the user is positive, negative or zero.
You will be using the if...else if...else
statement to write the program.
Example 1: Check Number Type with if…else if…else
// program that checks if the number is positive, negative or zero
// input from the user
let number = parseInt(prompt("Enter a number: "));
// check if number is greater than 0
if (number > 0) {
console.log("The number is positive");
}
// check if number is 0
else if (number == 0) {
console.log("The number is zero");
}
// if number is less than 0
else {
console.log("The number is negative");
}
Output
Enter a number: 0 The number is zero.
The above program checks if the number entered by the user is positive, negative or zero.
- The condition
number > 0
checks if the number is positive. - The condition
number == 0
checks if the number is zero. - The condition
number < 0
checks if the number is negative.
The above program can also be written using the nested if...else
statement.
Example 2: Check Number Type with nested if…else
// check if the number is positive, negative or zero
let number = prompt("Enter a number: ");
if (number >= 0) {
if (number == 0) {
console.log("The number is zero");
} else {
console.log("The number is positive");
}
} else {
console.log("The number is negative");
}
Output
Enter a number: 0 You entered number zero
The above program works the same as Example 1. However, the second example uses the nested if...else
statement.
JS Example for Beginners: Javascript Program to Check if a number is Positive, Negative, or Zero
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