ALGOL: Algolithmic Language

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  1. Actually so called RA60, Revised Algol-60.
  2. Ancestor of Pascal, Modula family, BCPL, C, C++, Simula and Ada.
  3. The first language defined formally by using BNF.
  4. Passing parameters by name.
  5. Example: Calculate 1*1 + 2*2 + 3*3 + ... + 10*10 = 385 

    'begin'
    'comment'
         Example of call by name.
    ;

    'integer' 'array' data [1:10];
    'integer' i;
    'integer' sum;

    'integer' 'procedure' GPS(I, N, Z, V);
    'integer' I, N, Z, V;
    'begin'
    	'for' I := 1 'step' 1 'until' N 'do'
            Z := V;
        GPS := 1
    'end';

    'for' i := 1 'step' 1 'until' 10 'do'
        data[i] := i * i;
    sum := 0;
    GPS(i, 10, sum, sum + data[i]);
    vprint("Result is ", sum)
'end'

  6. References:

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