RosettaCodeData/Task/Nth/ALGOL-68/nth.alg

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# PROC to suffix a number with st, nd, rd or th as appropriate #
PROC nth = ( INT number )STRING:
BEGIN
INT number mod 100 = number MOD 100;
# RESULT #
whole( number, 0 )
+ IF number mod 100 >= 10 AND number mod 100 <= 20
THEN
# numbers in the range 10 .. 20 always have "th" #
"th"
ELSE
# not in the range 10 .. 20, suffix is st, nd, rd or th #
# depending on the final digit #
CASE number MOD 10
IN # 1 # "st"
, # 2 # "nd"
, # 3 # "rd"
OUT "th"
ESAC
FI
END; # nth #
# PROC to test nth, displays nth for all numbers in the range from .. to #
PROC test nth = ( INT from, INT to )VOID:
BEGIN
INT test count := 0;
FOR test value FROM from TO to
DO
STRING test result = nth( test value );
print( ( " "[ 1 : 8 - UPB test result ], nth( test value ) ) );
test count +:= 1;
IF test count MOD 8 = 0
THEN
print( ( newline ) )
FI
OD;
print( ( newline ) )
END; # test nth #
main: (
test nth( 0, 25 );
test nth( 250, 265 );
test nth( 1000, 1025 )
)