In TypeScript, you can use floating-point numbers to represent decimal values. To declare a floating-point number, you can use the number keyword.
Here are some examples of using float numbers in TypeScript:
let num1: number = 3.14;
let num2: number = 1.5e3; // 1500
let num3: number = 0.1 + 0.2; // 0.30000000000000004
console.log(num1); // Output: 3.14
console.log(num2); // Output: 1500
console.log(num3.toFixed(1)); // Output: 0.3
In the above examples, num1 is a floating-point number with a value of 3.14. num2 is assigned a floating-point number using exponential notation (1.5e3 is equivalent to 1500). num3 is assigned the result of adding 0.1 and 0.2 which should be 0.3, but due to the floating-point arithmetic, the result is a very close approximation (0.30000000000000004).
You can also perform mathematical operations on floating-point numbers, just like any other numerical type:
let x: number = 5.2;
let y: number = 3.7;
let sum: number = x + y;
let product: number = x * y;
let quotient: number = x / y;
console.log(sum); // Output: 8.9
console.log(product); // Output: 19.24
console.log(quotient); // Output: 1.4054054054054055
In the above example, sum is the result of adding two floating-point numbers, x and y. product is the result of multiplying x and y, and quotient is the result of dividing x by y.