java - For 循环和数字的整除性

Question

我已经学习 Java 大约一周了，最近几天一直在搞 for 循环。我使用了 if 语句来测试数字在多个属性上的整除性。以下是我到目前为止所得到的。

int g = 18;

if ((g % 2 )== 0 && (g % 3)== 0)
{
    System.out.println("g is divisible by 2 and 3");
}
else
{
    System.out.println("g is not divisible by 2 and 3");
}

if ((g % 7 )== 0 || (g % 9) == 0)
{
    System.out.println("g is divisible by 7 or 9");
}
else
{
    System.out.println("g is not divisible by 7 or 9");
}

if (((g % 2 )== 0) && ((g % 3) == 0) && ((g % 5) != 0))
{
    System.out.println("g is divisible by 2 and 3 but 5");
}
else
{
    System.out.println("g is not divisible by 2 and 3 but 5");
}

我正在尝试使用 for 循环来修改上面的每个程序，以便在每个程序的单次运行中测试 1 到 100 之间的所有数字。下面是我的 for 语句。

for(g=1;g<=100;++g)

问题是，我的程序根本无法运行。我完全理解错了吗？如果方向正确，我们将不胜感激。非常感谢。

Answer 1

试试这个:

public class Sample {

    public static void main(String[] args) {

        for (int g = 1; g <= 100; g++) {
            if ((g % 2) == 0 && (g % 3) == 0) {
                System.out.println(g + " is divisible by 2 and 3");
            } else {
                System.out.println(g + " is not divisible by 2 and 3");
            }

            if ((g % 7) == 0 || (g % 9) == 0) {
                System.out.println(g + " is divisible by 7 or 9");
            } else {
                System.out.println(g + " is not divisible by 7 or 9");
            }

            if (((g % 2) == 0) && ((g % 3) == 0)) {
                if ((g % 5) == 0) {
                    System.out.println(g + " is divisible by 2 and 3 and 5");
                } else {
                    System.out.println(g + " is divisible by 2 and 3 but 5");
                }
            } else if ((g % 5) == 0) {
                System.out.println(g + " is not divisible by 2 and 3 but 5");
            } else {
                System.out.println(g + " is not divisible by 2 and 3 and 5");
            }
        }
    }
}