Kalkulačka

import React, { useState } from "react";
import { Input, Button } from "@/components/ui/input";
import { Card, CardContent } from "@/components/ui/card";
 
const MultiplicationCalculator = () => {
  const [num1, setNum1] = useState("");
  const [num2, setNum2] = useState("");
  const [result, setResult] = useState(null);
  const [error, setError] = useState("");
 
  const validateInput = (value) => {
    const num = Number(value);
    return Number.isInteger(num) && num >= 1 && num <= 10;
  };
 
  const calculate = () => {
    if (!validateInput(num1) || !validateInput(num2)) {
      setError("Zadejte pouze čísla od 1 do 10.");
      setResult(null);
      return;
    }
    setError("");
    setResult(num1 * num2);
  };
 
  return (
    <div className="flex flex-col items-center justify-center h-screen bg-gray-100 p-4">
      <Card className="w-full max-w-md p-6 bg-white shadow-lg rounded-2xl">
        <CardContent className="flex flex-col space-y-4">
          <h1 className="text-2xl font-bold text-center">Malá násobilka</h1>
          <div className="flex space-x-2">
            <Input
              type="number"
              placeholder="Číslo 1"
              value={num1}
              onChange={(e) => setNum1(e.target.value)}
              className="p-2 border rounded"
            />
            <span className="text-xl font-bold">×</span>
            <Input
              type="number"
              placeholder="Číslo 2"
              value={num2}
              onChange={(e) => setNum2(e.target.value)}
              className="p-2 border rounded"
            />
          </div>
          <Button onClick={calculate} className="p-2 bg-blue-500 text-white rounded">Vypočítat</Button>
          {error && <p className="text-red-500 text-center">{error}</p>}
          {result !== null && (
            <p className="text-xl text-center font-bold">Výsledek: {result}</p>
          )}
        </CardContent>
      </Card>
    </div>
  );
};
 
export default MultiplicationCalculator;