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Thread: Javascript maths problem

06032009, 11:40 AM #1
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Javascript maths problem
I'm having trouble with my script. The script is suppose to calculate how many computers & netbooks it can fit on a bench. A computer can fit 4 per bench (ratio 4:1) and a netbook can fit 5 per bench (5:1). The problem is if I enter 3 computers & 2 netbooks it would give me 2 benches instead of 1. I think I did my maths wrong
Code:<script type="text/javascript"> do { computer = window.prompt("How many desktop computers do you require?", "0"); computer_num = parseInt(computer); if (isNaN(computer_num)) /* If the user enters an invalid number it will prompt you to put a valid number */ { window.alert("Enter a number 0 or above") } } while(isNaN(computer_num)); computer_total = computer/4 do { netbook = window.prompt("How many netbooks do you require?", "0"); netbook_num = parseInt(netbook); if (isNaN(netbook_num)) { window.alert("Enter a number 0 or above") } } while(isNaN(netbook_num)); netbook_total = netbook/5 benches = Math.ceil(computer_total) + Math.ceil(netbook_total); document.writeln ("<p>" + benches + " benches</p>"); </script>
06032009, 11:56 AM
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No, you did your thoughts wrong. Just try it with real computers and benches.
06032009, 11:58 AM
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You need the ceiling of the addition, not the sum of the ceilings:Code:benches = Math.ceil(computer_total) + Math.ceil(netbook_total);
Code:benches = Math.ceil(computer_total + netbook_total);
06032009, 12:01 PM
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still gives me the answer of 2 benches if I input 3 computers & 2 netbooksCode:benches = Math.ceil(computer_total + netbook_total);
06032009, 01:20 PM
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