Question

我试图按照我的代码显示99瓶啤酒歌曲我没有得到else语句，程序应该有while和if语句，else语句虽然可能包含也可能不包括

public class bottles {

public static void main(String... s){

int beer = 99;

while(beer>=1){

if(beer>1){

System.out.print(beer + "bottles of beer on the wall ");
System.out.println(beer + "bottles of beer ");
System.out.print("Take one down and pass it around ");

beer = beer-1;

System.out.println(beer + "bottles of beer on the wall ");  

}   

if(beer==1){

System.out.print(beer + "bottles of beer on the wall ");
System.out.println(beer + "bottles of beer ");
System.out.print("Take one down and pass it around ");
System.out.println("no more bottles of beer on the wall. ");
System.out.println("");
}

else{

System.out.println("No more bottles of beer on the wall, no more bottles of beer.");
System.out.println("Go to the store and buy some more, 99 bottles of beer on thewall");
}



}

}

}

输出没有采用else语句。 java中的新手

Answer 1

因为你的循环只能运行while(beer>=1)

Answer 2

while循环将执行，直到您再没有啤酒。这意味着它最后一次执行是剩下1啤酒。您的else语句永远不会被执行。

所以只需将System.out.println("No more...放在while语句下（不包含else）：

while( more than 0 beer) {
    do sth...
}

// No more beers left
print "no more beers left";

Answer 3

你的其他人永远不会跑，好像啤酒＆gt; 1你的第一个如果有效，如果啤酒== 1，它会啤酒 - ，所以啤酒的价值== 0，你就不在你的圈子里了。比较值是从99到0不等。

条件：

1：值＆gt; 1和＆lt; 99：首先，如果值接受并继续减少

2：值达到：1，如果为你处理它，则为2，啤酒 - == 0;

3：value == 0，beer（0）＆gt; = 1为false所以你没有循环，而没有执行。所以你的其他东西从未通过代码

到达

 while(beer>=1)  //will run only if beer>=1
 {

if(beer>1)
{  //execute if beer>1

     beer -- //  this will work till beer>1

}   

if(beer==1)
{ //if beer==1 , this will execute

       beer-- // val of beer==0 ,So next time loop does't work

}

else{    // will be never called, if beer==0 you will never reach inside while so this never executes

}

}
}

Answer 4

这是代码尝试这个

 public static void main(String... args)
{
    int beer = 10;

    while(beer>=1){

    if(beer>1){

    System.out.print(beer + "bottles of beer on the wall ");
    System.out.println(beer + "bottles of beer ");
    System.out.print("Take one down and pass it around ");

    beer = beer-1;

    System.out.println(beer + "bottles of beer on the wall ");  

    }   

    if(beer==1){

    System.out.print(beer + "bottles of beer on the wall ");
    System.out.println(beer + "bottles of beer ");
    System.out.print("Take one down and pass it around ");
    System.out.println("no more bottles of beer on the wall. ");
    System.out.println("");
    }

    else{

    System.out.println("No more bottles of beer on the wall, no more bottles of beer.");
    System.out.println("Go to the store and buy some more, 99 bottles of beer on thewall");
    }
    beer--;
    }
}

if_else_loop程序错误，else语句不显示其内容（java代码）

4 个答案: