if_else_loop程序错误else语句不显示其内容（java代码）

Question

I am trying to display the 99 bottle beer song as per my code i am not getting the else statement, the program should have while and if statement, else statement though may or may not be included

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");
}



}

}

}

output is not taking the else statement. novice in java

Answer 1

因为您的循环只会while(beer>=1)

Answer 2

The while loop will execute until you have no more beer. This means the last time it gets executed is with 1 beer left. Your else statement can never be executed.

So just put System.out.println("No more... under your while statement ( without the else ):

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

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

Answer 3

Your else will never run ,As if beer>1 your first if works,if beer==1 ,it does beer-- ,so value of beer==0 ,and you are out of your loop.Beer value is ranging from 99 to 0.

Conditions:

1: value>1 and <99 : First if value takes it and keeps decreasing

2: value reaches : 1 , 2nd if handles it for you , does beer-- ==0;

3: value==0 , beer(0)>=1 is false so you are out of loop, while not executed . SO your else was never reached by code

 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

Here's the code try this one

 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--;
    }
}