26.5 Operations to Evaluate Strings

return an integer, respectively a rational as represented by the string str. Int returns fail if non-digit characters occur in str. For Rat, the argument string may start with the sign character '-', followed by either a sequence of digits or by two sequences of digits that are separated by one of the characters '/' or '.', where the latter stands for a decimal dot. (The methods only evaluate numbers but do not perform arithmetic!)

gap> Int("12345")+1;
12346
gap> Int("123/45");
fail
gap> Int("1+2");
fail
gap> Int("-12");
-12
gap> Rat("123/45");
41/15
gap> Rat( "123.45" );
2469/20

returns the ordinal of the integer n as a string.

gap> Ordinal(2);  Ordinal(21);  Ordinal(33);  Ordinal(-33);
"2nd"
"21st"
"33rd"
"-33th"

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