Editing Dartmouth BASIC (section)

===Third Edition===
The Third Edition, released in 1966 and the first to use the "edition" naming, was the first designed specifically with the intent of running on the new GE-635 computer which was due to arrive shortly. This version includes the <code>MAT</code> functions from CARDBASIC, and they can now use 0 as a subscript.{{sfn|Kurtz|1981|p=527}}

The new <code>SGN</code> function gave the sign of its argument (positive?0 and negative?1), while <code>RESTORE</code> was added to "rewind" the position of <code>READ/DATA</code>. The exponentiation problem was fixed, so {{code|-X^2}} would be interpreted as {{code|-(X^2)}}.{{sfn|Kurtz|1981|p=527}} Additionally, the <code>INT</code> function was changed to be a true floor, as opposed to trim-toward-zero, which allowed rounding to be implemented with <code>INT(X+0.5)</code>.{{sfn|Kurtz|1981|p=524}}

The major change in this version was the new <code>INPUT</code> statement, which parsed numeric values, making the language truly interactive during execution for the first time; previously the only control one had during execution was to type <code>STOP</code> in the monitor. Additionally, the system now allowed, and encouraged, loops to be indented, a feature that was not seen on most other versions of BASIC.{{sfn|Kurtz|1981|p=528}}