## Index 

Abs, 18,20, 192,204,211 Absolute value, see Abs Abstraction, 14 Action, concept of, 1,28, 143 Activation and formal parameters, 185 point, 172, 181, 187 Activations, 172, 177, 179-180 Active variant, of record, 70, 100, 158,191 Actual functional parameter, 122, 124, 188 parameter, 107-109, 111-113, 147, 175, 180, 185, 186-187 EBNF for, 187,219,225 lists, 106, 107, 170, 186-188 EBNF for, 187,219,225 syntax diagram for, 107, 234 procedural parameter, 117, 121, 188 value conformant-array parameter, 113, 187 value parameter, 110, 187 variable parameter, 110, 154, 175,187 

\dding operators, EBNF for, 165,218,225 operands of, 165 and precedence, 32,166 (see also Arithmetic operators) \ddresses, for pointer types, 94 \lgoI60, vii, 6, 7, 8,142-143 Algol-W, vii \lgorithm, 1, 179 I\ltemative representations, of symbols, 10, 148,212 
d. 16, 168,208,212 (see also Boolean operators) \postrophe, how to represent, 18, 150 Irahic to Roman, program for, -+4--46 'rL'Tan, 20, 193,204,211 . ,rL'langent, see ArcTan \rgument. see Parameter . ,rithmetic funL'tions. predeclared, 192-193 IJperations. on Boolean values, 8 llperators, 17, 146, 167, 208 : ~ rray ,'llmponents of, 144, 156 

