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== Description ==
:''This description is based on the original Bally manuals as well as the ACM description.''{{sfn|DeFanti|Fenton|Donato|1978}}
Zgrass was based on a standard set of BASIC commands and used most of its syntax. Where Zgrass differed from BASIC was that all commands were in fact [[function (programming)|function]]s and returned values, similar to the [[C (programming language)|C programming language]]. If there was no obvious return value it was expected that a function would return 1 if it succeeded, and 0 if it failed. For instance, the command <code>PRINT PRINT 10</code> would be illegal in BASIC, but in Zgrass this would print <code>10 1</code>, the 1 being the value returned by second <code>PRINT</code>, meaning "I successfully output the string '10'".
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