export class Problem {
	public A: number;
	public B: number;
	public k: -1 | 1;

	public getDescription() {
		let B = this.B.toString();

		if (B[0] === "-") {
			B = `(${B})`;
		}

		return `${this.A} ${this.k === -1 ? "-" : "+"} ${B} = ?`;
	}

	public solve() {
		return this.A + this.B * this.k;
	}

	protected constructor() {
		this.A = Math.floor(Math.random() * 201) - 100;
		this.B = Math.floor(Math.random() * 201) - 100;
		this.k = Math.random() < 0.5 ? 1 : -1;
	}
}