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Find largest and smallest number without array

Posted on 2009-07-06
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Last Modified: 2012-05-07
I would like to implement a program like follows:

Prompt the user to enter a bunch of numbers till a sentinel is enter.
Only output the max and min once the sentinel is enter.

What sentinel should I use, if all numbers entered are +ve and -ve integer.

public class MinMax{

public void main(String args[]){

int counter=0;

while(true){
    int firstNum;
    int num = readInt("Enter number:");
    if(counter==0){ firstNum=num;}
    counter++;
    max=min=firstnum;
    if(num==SENTINEL){
     if(num<min) println("Min:"+min)  ;
     if(num<max) println("Max:"+min)  ;
     break;  
    }//end if
}//end while
   
}//end main

}//end class
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Question by:peter_chong
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8 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 24783501
You haven't defined min/max

int max = Integer.MIN_VALUE;
max = Math.max(max, num);
int max = Integer.MIN_VALUE; // (before loop)

...

max = Math.max(max, num);

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Expert Comment

by:a_b
ID: 24783508
Can you ask the user how many number he wants to enter and then take as input that many numbers? Otherwise you might have to do some extra processing to get the numbers.
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Author Comment

by:peter_chong
ID: 24783850
To CEHJ,
Actually, this is an exercise that I try to sharpen my programming skill without using much reusable library and preferably write by my own functions.

To a_b,
Can you ask the user how many number he wants to enter and then take as input that many numbers?
Can not in this case.
Since this is an exercise that I try to sharpen my programming skill without using much reusable library and preferably write by my own functions.

Sorry Guys. :-)


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LVL 86

Expert Comment

by:CEHJ
ID: 24783860
>>
Actually, this is an exercise that I try to sharpen my programming skill without using much reusable library and preferably write by my own functions.
>>

Well there's very little difference actually in doing what i suggested and doing the below, but either way, you need to define the variable:
if (max < num) {

    max = num;

}

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Author Comment

by:peter_chong
ID: 24784288
Hi CEHJ,
How about the integer sentinel, if I allow all integers to be enter?

Any other alternative? (refer my code above)

thanks.
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LVL 86

Accepted Solution

by:
CEHJ earned 250 total points
ID: 24784415
>> if(num==SENTINEL){

Will take care of that. Just make sure that line comes before any ordering is done
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Author Comment

by:peter_chong
ID: 24786980
CEHJ:
Yes, you are right.

I honors 250 marks to you.
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LVL 86

Expert Comment

by:CEHJ
ID: 24787080
:-)
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