JAVA上机课,课后四个小题

蔚落 2022-08-13 14:54 118阅读 0赞

分别是55页的9,10,12,17小题

<pre name="code" class="java">package njtcstudent.com;
    
    import java.util.Scanner;
    
    public class test {
    
    	public static void main(String[] args) {
    		nine();//输入法10个数，输出最大值，最小值
    		ten();//鸡兔同笼问题
    		twelve();// 输入一个整数，输出各位数字之和
    		Seventeen();//求素数因子
    	}
    
    	public static void Seventeen() {
    		Scanner sc = new Scanner(System.in);
    		int num;
    		System.out.println("请输入一个整数:");
    		num = sc.nextInt();
    		for(int i=2;i*i<=num;){
    			if(num%i==0){
    				System.out.println("---->"+i);
    			num/=i;
    			}
    			else 
    				i++;
    		}
    		System.out.println("---->"+num);
    
    	}
    
    	public static void twelve() {
    		Scanner sc = new Scanner(System.in);
    		Integer num;
    		int sum = 0;
    		System.out.println("请输入一个整数:");
    		num = sc.nextInt();
    		String str = num.toString();
    		for (int i = 0; i < str.length(); i++) {
    			sum = sum + str.charAt(i) - '0';
    		}
    		System.out.println("各位数之各为:" + sum);
    	}
    
    	public static void ten() {
    		int chicken = 1, rabbit = 1;
    		for (; chicken < 40; chicken++) {
    			rabbit = 40 - chicken;
    			if ((chicken * 2 + rabbit * 4 == 100) && chicken + rabbit == 40) {
    				break;
    			}
    		}
    		System.out.println("chicken:" + chicken);
    		System.out.println("rabbit:" + rabbit);
    	}
    
    	public static void nine() {
    		Scanner sc = new Scanner(System.in);
    		int max = 0, min = 0, temp;
    		for (int i = 1; i <= 10; i++) {
    			System.out.println("请输入第" + i + "个数:");
    			temp = sc.nextInt();
    			if (i == 1) {
    				max = temp;
    				min = temp;
    			} else {
    				if (temp < min) {
    					min = temp;
    				}
    				if (temp > max) {
    					max = temp;
    				}
    			}
    		}
    		System.out.println("最大的数是:" + max);
    		System.out.println("最小的数是:" + min);
    	}
    
    }