Question

用穷举法找出2到50之间的质数(JAVA程序）

Answer 1

代码如下，供参考 

public class Test {
    public static void main(String[] args) {
        for (int i = 2; i <= 50; i++) {
            if (check(i)) {
                System.out.println(i);
            }
        } 
    }
    private static boolean check(int num){
        for (int i = 2; i < num; i++) {
            if (num % i == 0) {
                return false;
            }
        }
        return true;
    }
}

Answer 2

int i, k;
boolean fal;
for (k = 2; k <= 50; k++) {
    fal = true;
    i = 2;
    while (i <= k - 1 && fal) {
    if (k % i == 0)
        fal = false;
        i++;
    }
    if (fal)
    System.out.print(k + " ");
}

Answer 3

for(int i = 2;i<=50;i++)
{
for(int j = 2;j<i;j++){
if(i%j==0){
System.out.println(i);
continue;
}
}
}