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===Basic data types and operators===
The basic variable types in SAIL are [[Integer (computer science)|integers]], [[Floating-point arithmetic|reals]] (floating point), [[Boolean data type|booleans]], and [[String (computer science)|strings]].{{sfn|Smith|1976|p=2}} Type conversions were automatic, so {{code|INTEGER i;i←SQRT(5);|pascal}} would convert the value 5 to a double as that is what SQRT requires, and then cast the result to an integer.{{sfn|Smith|1976|p=13}} Any of these types can be turned into an array by adding the {{code|ARRAY}} qualifier and placing the array bounds in brackets, for instance, {{code|REAL ARRAY weeks[1:52]);|pascal}}. SAIL supported 1-d and 2-d arrays.{{sfn|Smith|1976|p=4}}
The language used the left-arrow for assignment, {{code|←}}, or the underscore on platforms that did not have [[Stanford ASCII]].{{sfn|Smith|1976|p=5}} It included a number of standard functions like [[square root]], all of the common math operators, and was otherwise similar to most ALGOL derivatives for normal programming.{{sfn|Smith|1976|p=6}}
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