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
const 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 > 0checks if the number is positive. - The condition
number == 0checks if the number is zero. - The condition
number < 0checks 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
const 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.
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