簡単な数学の問題を処理するプログラムを作成しています。私がやろうとしているのは、スキャナーレベルに文字列を入力してもエラーにならないようにすることです。レベルは、数学の問題の難易度を選択することです。私は parseInt を試しましたが、今何をすべきか途方に暮れています。
import java.util.Random;
import java.util.Scanner;
public class Test {
static Scanner keyboard = new Scanner(System.in);
static Random generator = new Random();
public static void main(String[] args) {
String level = intro();//This method intorduces the program,
questions(level);//This does the actual computation.
}
public static String intro() {
System.out.println("HI - I am your friendly arithmetic tutor.");
System.out.print("What is your name? ");
String name = keyboard.nextLine();
System.out.print("What level do you choose? ");
String level = keyboard.nextLine();
System.out.println("OK " + name + ", here are ten exercises for you at the level " + level + ".");
System.out.println("Good luck.");
return level;
}
public static void questions(String level) {
int value = 0, random1 = 0, random2 = 0;
int r = 0, score = 0;
int x = Integer.parseInt("level");
if (x==1) {
r = 4;
}
else if(x==2) {
r = 9;
}
else if(x==3) {
r = 50;
}
for (int i = 0; i<10; i++) {
random1 = generator.nextInt(r);//first random number.
random2 = generator.nextInt(r);//second random number.
System.out.print(random1 + " + " + random2 + " = ");
int ans = keyboard.nextInt();
if((random1 + random2)== ans) {
System.out.println("Your answer is correct!");
score+=1;
}
else if ((random1 + random2)!= ans) {
System.out.println("Your answer is wrong!");
}
}
if (score==10 || score==9) {
if (score==10 && x == 3) {
System.out.println("This system is of no further use.");
}
else {
System.out.println("Choose a higher difficulty");
}
System.out.println("You got " + score + " out or 10");
}
else if (score<=8 && score>=6) {
System.out.println("You got " + score + " out or 10");
System.out.println("Do the test again");
}
else if (score>6) {
System.out.println("You got " + score + " out or 10");
System.out.println("Come back for extra lessons");
}
}
}