1. 从键盘接受周一到周五每天学习时间;
import java.util.Scanner; public class For { public static void main(String[] args) { //Chicken(); int time ; //时间 int temporal=0; //总共的时间 double avg; //求平均时间 Scanner input = new Scanner(System.in); for (int i = 0; i < 5; i++) { System.out.print("请输入周"+(i+1)+"的学习时间:"); time =input.nextInt(); temporal+=time; // 时间之和 } avg = (double)temporal/5; System.out.println("周一到周五的学习时间是:"+avg+"小时"); } }
2.鸡兔同笼:
import java.util.Scanner; public class For { public static void main(String[] args) { int chookNum; //声明鸡 int rabbitNum; //声明兔 for (chookNum=0; chookNum<=35;chookNum++) { rabbitNum = 35-chookNum; //鸡兔总共的数量-鸡的数量就等于兔子的数量 if(2*chookNum+4*rabbitNum==94) { System.out.println("鸡有:"+chookNum+"只"+ "\n"+ "兔有:"+rabbitNum+"只"); } } } }
3.开发一个标题为“FliFlop”的游戏应用程序。
public class For2 { public static void main(String[] args) { for(int i =1;i<=100;i++) { if(i%3==0 && i%5==0) { System.out.println("FlipFiop"); } if(i%3==0) { System.out.println("Flip"); continue; } if(i%5==0) { System.out.println("Fiop"); continue; } if(!(i%3==0 && i%5==0)) { System.out.println(i); continue; } } } }
4.马克思有一道有趣味的数学问题;
public class For3 { public static void main(String[] args) { int men, women, kids; //声明男人 ,女人 ,小孩, for ( men = 0; men <=10; men++) { for(women=0;women<=30;women++) { for (kids = 0; kids<=30; kids++) { if(men+women+kids==30 && 3*men+2*women+kids==50) { //判断条件 System.out.println("男人数;"+men+"\n"+"女人数:"+women+"\n"+"小孩子:"+kids+"\n"); } } } } } }