Java Help

[minutrice]

Ok... I'm not trying to get you to do my homework. I just need some help b/c this is a sample question for my test tomorrow. I know the answer is b = 6 but how did they get it? I don't understand the b += a--; part. I know that a-- is a postfix and means a = a - 1 but what about the b += part of that? Thanks for the help.... Josh

Java Sample1 5

public class Sample1{

public static void main(String [] args){
int a, b = 0;
a = Integer.parseInt( args[0] );

do {
switch ( a ) {
case 3:
b += a --;
break;
case 2:
b += --a;
break;
case 1:
b += 2 * a --;
break;
default:
--a;
}
}while ( a >= 0 );
System.out.print ( "b is " );
System.out.println ( b );
}
}

[minutrice]

hmmm there isn't any formatting... sorry. It was formatted when I posted it.

[aym]

x += y; (x is of type type1) means:
x = (type1)(x + y);

so since a is of the type int:

b += a--; means b = (int)(b + a--);

[aym]

To format your text, use   instead of the space char.

[minutrice]

thanks for the reply. I messed around with it until I finally figured it out.

Thanks again,

Josh

[Paul Victorey]

I think you can also use UBB tags:

[code]

put your code here

[/code]

It would look like this:

int main(){
   doNothing();
   return 0;
}

[minutrice]

Just trying to see if it works



Java Sample1 5



public class Sample1{

public static void main(String [] args){
int a, b = 0;
a = Integer.parseInt( args[0] );

do {
switch ( a ) {
case 3:
b += a --;
break;
case 2:
b += --a;
break;
case 1:
b += 2 * a --;
break;
default:
--a;
}
}while ( a >= 0 );
System.out.print ( "b is " );
System.out.println ( b );
}
}



hmm did it work?

[minutrice]

Java Sample1 5

public class Sample1{ 

 public static void main(String [] args){ 
   int a, b = 0; 
   a = Integer.parseInt( args[0] ); 

      do { 
         switch ( a ) { 
         case 3: 
               b += a --; 
               break; 
         case 2: 
               b += --a; 
               break; 
         case 1: 
               b += 2 * a --; 
               break; 
         default: 
               --a; 
         } 
      }while ( a >= 0 ); 
  System.out.print ( "b is " ); 
  System.out.println ( b ); 
 } 
}

trying again