Re: More Funny Stuff From Joel

On 6/13/2024 2:05 AM, candycanearter07 wrote:

DFS <nospam@dfs.com> wrote at 13:15 this Wednesday (GMT):

On 6/12/2024 2:35 AM, candycanearter07 wrote:

DFS <nospam@dfs.com> wrote at 16:20 this Tuesday (GMT):

>
>

3) write your own C to calc the mean, median and mode of:
>
1,2,3,4,5,5,6,7,8,9

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#include <stdio.h>
#define COUNT_CNT 10
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int nums[] = {1, 2, 3, 4, 5, 5, 6, 7, 8, 9, -1};
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int main()
{
double mean;
int median, mode, md_count[COUNT_CNT], len;
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for( len = 0; nums[len] != -1; len++ )
{
mean += nums[len];
md_count[nums[len]]++;
}
mean /= len;
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if(len % 2 == 0)
{
int mid = len / 2;
median = nums[mid] + nums[mid + 1]];
median /= 2;
}
else
median = nums[len / 2];

for( int i = 0; i < COUNT_CNT; i++ )
{
if(md_count[mode] < md_count[i]) mode = i;
}
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printf("mean %g, median %d, mode %d", mean, median, mode);
}
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These compiled fine on my machine (gcc 12.2.0)

>
>
Did you actually run the code?

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Yes, but I also typed it into slrn by hand bc I was worried that pasting
it would mess up word wrapping
>

I got a segfault (WSL Ubuntu, gcc 11.4).  Had to make a few tweaks to
get it to run and provide correct answers.
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Do you want me to tell you what I did, or do you want to figure it out?
>
Hint: after the line "mean /= len;" print out the contents of
md_count[].  You should get:
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1. 1
2. 1
3. 1
4. 1
5. 2
6. 1
7. 1
8. 1
9. 1

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I don't see it sorry ^^:

>
>
You don't see what?

  The mistake I made.

Did you print the contents of md_count[] ?  That should give you a clue.
The code you posted shouldn't have run.  What answers did it give you?