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Arrays

Posted on 2006-06-17
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Last Modified: 2010-04-15
write a c program segment to display the index of the smallest and the largest numbers in an array x of 20 integers. Assume array x already has values assigned to each element.

so arrays means using int x[20]? I don't know how you to make the program pick the smallest and the largest from a set of 20 integers. This teach yourself class is very difficult for me.

thanks
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Question by:thunderrolls
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PaulCaswell earned 125 total points
ID: 16927242
Hi thunderrolls,

To find the maximum value of an array, start by setting a value to something lower than you can reasonably expect to see. Then loop through the array. For each element, if it is greater than your current value, set your value to it.

Minimum is just the opposite way around.

Paul
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Expert Comment

by:Harisha M G
ID: 16927367
OK.. I'll try algorithm this time ;)

set min to arr[0]
set max to arr[0]
loop from 1st to 19th element (i<20) and in each iteration, perform the below operations:
  if  max < current element, max = current element
  if  min > current element, min = current element

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Expert Comment

by:Khanh Doan
ID: 16929134
oops, sorry

thunderrolls, first of all, you should assgin min, max to the first element of array:
min = max = x[0];

Then you use the loop FOR
for (i = 0; i < 20; i++)

then you use IF statement.
if (max < x[i]) max = x[i];
if (min > x[i]) min = x[i];

Finally, you output min, max value by prinft("Min : %d, Max : %d", min, max);

Goodluck.
Bonmat86.
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Author Comment

by:thunderrolls
ID: 16930644
is this even close?

int small = 0;
      int large = 0;
      int i;

      for(i=0; i<20; ++i) {
            if(x[i] > x[large])
                  large = i;
            if(x[i] < x[small])
                  small = i;
      }

      printf("Smallest is at: %d \n", small);
      printf("Largest is at: %d \n", large);
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Expert Comment

by:Harisha M G
ID: 16930667
Good :)
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Expert Comment

by:PaulCaswell
ID: 16930741
>>          if(x[i] > x[large])

This might work better:

          if(x[i] > large)

Paul
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Expert Comment

by:PaulCaswell
ID: 16930742
Oops!

and

>>               large = i;

you'd be better off with:

               large = x[i];

see 'large' is just a number and 'x' is an array. That means that most of the time when you see an x it should have a '[' next to it while large will almost certainly not have one associated with it.

Paul
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Expert Comment

by:Harisha M G
ID: 16930749
Paul, the code posted by the author works perfectly without any flaws. Why are you introducing the bugs ?
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Expert Comment

by:PaulCaswell
ID: 16930795
Harish,

Ahhhh.. I seee. :-)

thunderrolls,

I completeley misread your code. My apologies! Please ignore my above posts.

I was trying to find you the highest value, without interest in where it is. Mine is a very slightly faster algorithm that only delivers the highest value, not 'where it is'. Harish's solution is a much more flexible and equally tidy technique that I would like to see more often.

Paul
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