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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Detect-division-by-zero/ALGOL-W/detect-division-by-zero.alg Normal file
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begin
% integer division procedure %
% sets c to a divided by b, returns true if the division was OK, %
% false if there was division by zero %
logical procedure divideI ( integer value a, b; integer result c ) ;
begin
% set exception handling to allow integer division by zero to occur once %
INTDIVZERO := EXCEPTION( false, 1, 0, false, "INTDIVZERO" );
c := a div b;
not XCPNOTED(INTDIVZERO)
end divideI ;
% real division procedure %
% sets c to a divided by b, returns true if the division was OK, %
% false if there was division by zero %
logical procedure divideR ( long real value a, b; long real result c ) ;
begin
% set exception handling to allow realdivision by zero to occur once %
DIVZERO := EXCEPTION( false, 1, 0, false, "DIVZERO" );
c := a / b;
not XCPNOTED(DIVZERO)
end divideR ;
integer c;
real d;
write( divideI( 4, 2, c ) ); % prints false as no exception %
write( divideI( 5, 0, c ) ); % prints true as division by zero was detected %
write( divideR( 4, 2, d ) ); % prints false as no exception %
write( divideR( 5, 0, d ) ) % prints true as division by zero was detected %
end.