34 lines
765 B
JavaScript
34 lines
765 B
JavaScript
var e = '3 4 2 * 1 5 - 2 3 ^ ^ / +'
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eval: {
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document.write(e, '<br>')
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var s=[], e=e.split(' ')
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for (var i in e) {
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var t=e[i], n=+t
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if (!t) continue
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if (n == t)
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s.push(n)
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else {
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if ('+-*/^'.indexOf(t) == -1) {
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document.write(t, ': ', s, '<br>', 'Unknown operator!<br>')
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break eval
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}
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if (s.length<2) {
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document.write(t, ': ', s, '<br>', 'Insufficient operands!<br>')
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break eval
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}
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var o2=s.pop(), o1=s.pop()
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switch (t) {
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case '+': s.push(o1+o2); break
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case '-': s.push(o1-o2); break
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case '*': s.push(o1*o2); break
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case '/': s.push(o1/o2); break
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case '^': s.push(Math.pow(o1,o2))
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}
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}
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document.write(t, ': ', s, '<br>')
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}
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if (s.length>1) {
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document.write('Insufficient operators!<br>')
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}
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}
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