将数字转换为十亿卢比
作为开发人员,经常会遇到将数字转换为单词的任务。虽然现有的代码选项可能看起来很长,但本文旨在提供一种更简洁的方法。
现有方法
给定的代码采用正则表达式和循环进行单词转换:
<code class="javascript">var th = ['','thousand','million', 'billion','trillion']; var dg = ['zero','one','two','three','four', 'five','six','seven','eight','nine']; var tn = ['ten','eleven','twelve','thirteen', 'fourteen','fifteen','sixteen', 'seventeen','eighteen','nineteen']; var tw = ['twenty','thirty','forty','fifty', 'sixty','seventy','eighty','ninety']; function toWords(s) { ... }</code>
南亚编号系统
但是,此代码使用西方编号系统(百万/十亿)转换数字。要使其适应南亚系统(十万/千万),需要进行修改。
简洁代码
以下代码提供了简化的解决方案:
<code class="javascript">var a = ['','one ','two ','three ','four ', 'five ','six ','seven ','eight ','nine ','ten ','eleven ','twelve ','thirteen ','fourteen ','fifteen ','sixteen ','seventeen ','eighteen ','nineteen ']; var b = ['', '', 'twenty','thirty','forty','fifty', 'sixty','seventy','eighty','ninety']; function inWords (num) { if ((num = num.toString()).length > 9) return 'overflow'; n = ('000000000' + num).substr(-9).match(/^(\d{2})(\d{2})(\d{2})(\d{1})(\d{2})$/); if (!n) return; var str = ''; str += (n[1] != 0) ? (a[Number(n[1])] || b[n[1][0]] + ' ' + a[n[1][1]]) + 'crore ' : ''; str += (n[2] != 0) ? (a[Number(n[2])] || b[n[2][0]] + ' ' + a[n[2][1]]) + 'lakh ' : ''; str += (n[3] != 0) ? (a[Number(n[3])] || b[n[3][0]] + ' ' + a[n[3][1]]) + 'thousand ' : ''; str += (n[4] != 0) ? (a[Number(n[4])] || b[n[4][0]] + ' ' + a[n[4][1]]) + 'hundred ' : ''; str += (n[5] != 0) ? ((str != '') ? 'and ' : '') + (a[Number(n[5])] || b[n[5][0]] + ' ' + a[n[5][1]]) + 'only ' : ''; return str; }</code>
此修订后的代码将数字转换为南亚编号系统中的单词,占十亿和千万。
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