20 lines
1.1 KiB
JavaScript
20 lines
1.1 KiB
JavaScript
var baselist = "0123456789abcdefghijklmnopqrstuvwxyz", listbase = [];
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for(var i = 0; i < baselist.length; i++) listbase[baselist[i]] = i; // Generate baselist reverse
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function basechange(snumber, frombase, tobase)
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{
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var i, t, to = new Array(Math.ceil(snumber.length * Math.log(frombase) / Math.log(tobase))), accumulator;
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if(1 < frombase < baselist.length || 1 < tobase < baselist.length) console.error("Invalid or unsupported base!");
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while(snumber[0] == baselist[0] && snumber.length > 1) snumber = snumber.substr(1); // Remove leading zeros character
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console.log("Number is", snumber, "in base", frombase, "to base", tobase, "result should be",
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parseInt(snumber, frombase).toString(tobase));
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for(i = snumber.length - 1, inexp = 1; i > -1; i--, inexp *= frombase)
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for(accumulator = listbase[snumber[i]] * inexp, t = to.length - 1; accumulator > 0 || t >= 0; t--)
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{
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accumulator += listbase[to[t] || 0];
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to[t] = baselist[(accumulator % tobase) || 0];
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accumulator = Math.floor(accumulator / tobase);
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}
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return to.join('');
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}
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console.log("Result:", basechange("zzzzzzzzzz", 36, 10));
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