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Additional info for An Introduction to Algol 68 through Problems
The procedure body of 'leap' could be replaced by (n mod 4 = 0 and n mod 100 i= 0 or n mod 400 = 0 and n mod 40004=0)', which is also exactly true when n is a leap year. In the previous case, with the if clause as procedure body, if m is not divisible by 4 (which happens 3/4 of the time), then m mod 4 i= 0 and the result false is obtained without further calculation. The alternative boolean expression will be evaluated completely for any given year (unless the compiler optimises boolean expressions).
On the right-hand side, 2*n is evaluated to the integer I2, and both 'n' and 't' are made to refer to it. The effect is to double the value that 't' refers to, and the local name 'n' 'dies' when we leave the closed clause where it is declared. 'double( 6)' would be an incorrect call of this procedure, since 6 is not a name. An example more relevant to this chapter would be a procedure to advance the date to the next working day, assuming a 5-day week and ignoring public holidays. 'proc advance date=( char day, ref int date,month,year)void: (int n = nodays in(month, year); date plusab (day= "FRI" 131 : day= "SAT" 12 II); C 1: is an abbreviation of elif C if date> n then date rninusab n; if month= I2 then month := I ; year plusab I else month plusab I fi fi)' The parameters 'month', 'year' and 'date' are all ref int because they may be altered by the procedure.
This is the output of the above program for a particular maze SQUARE MAZE OF SIZE . *. * ENTRANCE COORDS = I 3 3 EXIT COORDS = 3 2 MAZE SOLVED BY FOLLOWING THE PATH WWSSE When developing the program, additional information should be printed to help debugging, such as the coordinates of every move made and of the dead ends pruned. The special 'print' instructions can be removed when the program works correctly. ) TRAVERSING A MAZE: MULTIPLE VALUES 35 The algorithm should also be tested on data where there is no route out, on illegal data and on a maze where several dead ends are encountered before a path is found.