我的程序目前拒绝除整数之外的任何输入,但我试图更进一步,让它只接受正整数 . 我怎么做到这一点 . 我尝试创建另一个布尔值并将其称为numisGreat,并为此部分调用另一个do-while循环,但我似乎无法得到它 .
import java.util.Scanner;
public class TandE {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int firstN = 0;
int secondN = 0;
boolean isNumber = false;
boolean numisGreat = false;
System.out.print("Enter a positive integer: ");
do {
if (input.hasNextInt()) {
firstN = input.nextInt();
isNumber = true;
} else {
System.out.print("Please enter a positive integer: ");
isNumber = false;
input.next();
}
} while (!(isNumber));
System.out.print("Enter another positive integer: ");
do {
if (input.hasNextInt()) {
secondN = input.nextInt();
isNumber = true;
} else {
System.out.print("Please enter a positive integer: ");
isNumber = false;
input.next();
}
} while (!(isNumber));
System.out.println("The GCD of " + firstN + " and " + secondN + " is " + gCd(firstN, secondN));
}
public static int gCd(int firstN, int secondN) {
if (secondN == 0) {
return firstN;
} else
return gCd(secondN, firstN % secondN);
}
}
1 回答
只需添加一个测试输入数字是否为正的条件: