You can find the largest among three numbers using the if...else
statement.
Example 1: Largest Number Among Three Numbers
// program to find the largest among three numbers
// take input from the user
const num1 = parseFloat(prompt("Enter first number: "));
const num2 = parseFloat(prompt("Enter second number: "));
const num3 = parseFloat(prompt("Enter third number: "));
let largest;
// check the condition
if(num1 >= num2 && num1 >= num3) {
largest = num1;
}
else if (num2 >= num1 && num2 >= num3) {
largest = num2;
}
else {
largest = num3;
}
// display the result
console.log("The largest number is " + largest);
Output
Enter first number: -7 Enter second number: -5 Enter third number: -1 The largest number is -1
In the above program, parseFloat() is used to convert numeric string to number. If the string is a floating number, parseFloat()
converts the string into a floating point number.
The numbers are compared with one another using greater than or equal to >=
operator. And the if...else if...else
statement is used to check the condition.
Here, logical AND &&
is also used to check two conditions.
You can also use the JavaScript built-in Math.max()
function to find the largest among the numbers.
Example2: Using Math.max()
// program to find the largest among three numbers
// take input from the user
const num1 = parseFloat(prompt("Enter first number: "));
const num2 = parseFloat(prompt("Enter second number: "));
const num3 = parseFloat(prompt("Enter third number: "));
const largest = Math.max(num1, num2, num3);
// display the result
console.log("The largest number is " + largest);
Output
Enter first number: 5 Enter second number: 5.5 Enter third number: 5.6 The largest number is 5.6
Math.max() returns the largest number among the provided numbers.
Also Read:
- Math.min() - to find the smallest among the numbers