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POWorking with percentage in c#
 

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    <p>Ok, here's the thing. From <code>DataTable</code> i read <strong>number_of_project</strong> and <strong>number_of_hours_per_day</strong> (most of time 5 to 7 hours per day). For each <strong>project</strong> i insert <strong>percentage_value</strong> with dynamically created <code>TextBoxes</code> (Sum off all <strong>percentage_values</strong> is 100%). Formula for percentage must calculate <strong>hours_for_project_per_day</strong>.</p> <pre><code> double hours_for_project_per_day = percentage_value * number_of_hours_per_day / 100; </code></pre> <p>On the end i <code>Round</code> <strong>hours_for_project_per_day</strong>. In many times calculation is right, but i get some non correct values (because of <code>Rounding</code>) in case like this:</p> <pre><code> number_of_project = 5; number_of_hours_per_day = 7; percentage_value | project | (Math.Round)hours_for_project_per_day (double values) -----------------|---------|------------------------------------------------------ 30 | P1 | 2 (2,1) 17 | P2 | 1 (1,19) 18 | P3 | 1 (1,26) 20 | P4 | 1 (1,4) 15 | P5 | 1 (1,05) ------------------------------------------- sum 100 | 5 | 6 (instead 7) </code></pre> <p><strong>My question is:</strong> Can i do this some other way <strong>or</strong> just check if <code>if(sum_hours_for_project_per_day != number_of_hours_per_day)</code> and find <strong>hours_for_project_per_day</strong> with max decimal value (in this case 1,4) and put value 2? Hope you know what i'm trying to do.</p>
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    1. USJanOlMajti
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    1. COChange 100 to 100.0 in: double hours_for_project_per_day = percentage_value * number_of_hours_per_day / 100;
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      1. USMichel Keijzers
    2. COwell, there's no getting around the fact that the sum of fractions and the sum of their rounded values are different. that's just math :) I would suggest either rounding them to 2,3, or whatever decimal places (won't solve your problem, but would diminish it), or going with your second idea, which seems OK to me.
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      1. USJ. Ed
    3. COAre you using a database you can query?
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      1. USPeter
 

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