1,列印數字

public class Num { 
	public static void main(String[] args){ 
		Scanner input = new Scanner(System.in);
		System.out.print("請輸入行數："); 
		int hang =input.nextInt();
		for(int i=1;i<=hang;i++) { //列印行數 
			for(int j =1;j<=i;j++) { //每行數字個數 
				System.out.print(j+" "); 
				}
				System.out.println(); //每迴圈一次換行 
			}
		}
	}

2,百錢買白雞

public class Chick {
 public static void main(String[] args) {
  int i;  //公雞
  int j;  //母雞
  int k;  //小雞
  for( i=1;i<=20;i++) {  //公雞數
   
   for( j=1;j<=33;j++) {  //母雞數
        
      for(k=3;k<=99;k+=3) {  //小雞數
       
       if(5*i+3*j+k/3==100&&i+j+k==100) {  //雞的總數以及買雞的價格關係
        
        System.out.println("公雞："+i+"\t"+"母雞："+j+"\t"+"小雞："+k);
       }
      }
      }
   
  }
 }

}

 

3,模擬取款機

public static void Blank() { 

 Scanner scanner = new Scanner(System.in); 

 for (int i = 0; i < 3; i++) { 

  System.out.print("請輸入密碼："); 

  int password = scanner.nextInt(); 

  if (password == 111111) {  //初識化密碼

 System.out.print("請輸入金額："); 

  int money = scanner.nextInt(); 

   while ((money % 100 == 0 && money > 0 && money <= 1000) == false) { //如果不滿足條件退出迴圈
 

    System.out.print("您輸入的金額不合法，請重新輸入："); 

    money = scanner.nextInt(); } 

   System.out.print("您取出了" + money + "元\n"); break; } else { if (i == 2) {

     System.out.println("您已輸錯3次，請下次再來！"); } continue; } }  //輸錯3次退出迴圈

 System.out.println("交易完成，請取卡！"); }

public class Stale {
    public static void main(String[] args) {
  
 
                                              
  Scanner input=new Scanner(System.in);
  System.out.print("請輸入菱形行數：");
  int rows=input.nextInt();
  while(rows%2==0) {
   System.out.print("請輸入奇數：");
   rows=input.nextInt();
  }
  int a=(rows+1)/2; //列印一半
  for(int i=1;i<=a;i++) {  //菱形的行數
   for(int j=1;j<=a-i;j++) {  //空格數
    System.out.print(" ");
   }
   for(int k=1;k<=2*i-1;k++) {  //星星的個數
    System.out.print("*");
   }
   System.out.println(" ");
  }
  for(int i=1;i<=a-1;i++) {  //列印下半部分
   for(int j=1;j<=i;j++) {
    System.out.print(" ");}
    for(int k=1;k<=rows-2*i;k++) {
     System.out.print("*");
    }
    
   
   System.out.println(" "); 
  }
 }
}