# How computers get it wrong: 2+2 = 5

Monday, 4 March 2013 - 6:00pm

Barnard’s Inn Hall

## Subject:

## Overview

When lives depend on calculations, human error can kill. From the early days of computing, one problem has been that they generally work with a fixed number of digits, creating rounding errors. Chaos Theory has shown new ways in which computer arithmetic can give misleading results. Such problems are not just theoretical - legend has it that one programmer became rich transferring the fractions of a penny lost in rounding errors into his own account!