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SAMPLES
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YESNO.PAS
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Pascal/Delphi Source File
|
1990-02-12
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1KB
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35 lines
(*$c+*)
program yesno(Input, Output);
const blanks = ' ';
var x : packed array[1 .. 5] of char;
i : integer;
test : boolean;
begin
{ WHEREIN WE DEMONSTRATE STRING ASSIGNMENT AND COMPARISON; }
{ NOTE THAT, IF YOU TYPE IN MORE THAN 5 CHARACTERS, THE }
{ OVERFLOW CHARACTERS WILL BE LOST AND NOT PRINTED OUT: }
repeat
{ IN THIS SYSTEM, ALL CHARACTER AND BOOLEAN ARRAYS }
{ ARE IMPLICITLY 'PACKED' AS C char ARRAYS; SO THE }
{ 'packed' KEYWORD HAS NO EFFECT. STRING CONSTANT }
{ ASSIGNED TO A PACKED CHAR ARRAY: }
x := blanks;
i := 0;
test := true;
write('Enter yes or no for the test: ');
while not eoln and (i < 5) do
begin i := i + 1; read(x[i]) end;
{ PASCAL REQUIRES THAT YOU CLEAR THE EOLN CONDITION: }
readln; writeln;
{ NOTE THAT WE ARE WRITING A char ARRAY HERE; THE }
{ ':i' IS A VARIABLE FIELD-WIDTH SPECIFIER: }
writeln('You entered ''', x:i,'''.');
{ STRING COMPARISON ETIQUETTE: }
if (x <> 'yes ') and (x <> 'no ') then
begin
test := false;
writeln('You have to enter either ''yes'' or ''no''.')
end
until test
end.