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5 Standard prelude ¶

The Algol 68 Revised Report defines an extensive set of standard modes, operators, procedures and values, collectively known as the standard prelude.

The standard prelude is available to Algol 68 programs without needing to import any module.

For brevity, in this section the pseudo-mode L represents a shortsety, i.e. a sequence of either zero or more LONG or zero or more SHORT.

• Environment enquiries
• Standard modes
• Standard priorities
• Rows operators
• Boolean operators
• Integral operators
• Real operators
• Character operators
• String operators
• Complex operators
• Bits operators
• Bytes operators
• Semaphore operators
• Math procedures