题目内容

If it ___________ (has been, not) for your help, I really don’t know what I’d have done.

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I ___________ (mean) to call on you, but was prevented from doing so.

程序填空题：从键盘输入一个整数，输出它的绝对值。public class AbsoluteValue{ public static void main(String[] args){Scanner scan=new Scanner(System.in);System.out.println("请输入一个整数");int num=scan.(1);int absolute=0;if(absolute>=0){absolute=(2);}else{absolute=(3);}System.out.println("绝对值为："+absolute);}}

打印200-300之间的所有素数System.out.println("200-300之间的素数有:");for (int num = 200; num <= 300; num++){boolean isPrime =;for (int i = 2; i <= num - 1; i++){if (){isPrime =;break;}}if (isPrime){System.out.print(num + " ");}}

输入一个正整数,并做以下运算:如果为偶数,除以2;如果为奇数,乘3加1。得到的结果再按上述要求运算,直到最后的结果为1,经过多少次这样的运算才得到数1。public Test{public void main(string[] args){System.out.println("请输入一个正整数:");Scanner sc=new Scanner(System.in);int num =;int count = 0;while (num != 1){if (){num = num / 2;}else{num=num*3+1;};}System.out.println("次数为:" + count);}}