Exponentiation operator: Difference between revisions

=={{header|PL/I}}==

<lang PL/I>

declare exp generic

iexp when (fixed binary, fixed binary),

fexp when (float, fixed binary);

iexp: procedure (m, n) returns (fixed binary (31));

declare (m, n) fixed binary (31) nonassignable;

declare exp fixed binary (31) initial (m), i fixed binary;

if m = 0 & n = 0 then signal error;

if n = 0 then return (1);

do i = 2 to n;

exp = exp * m;

end;

return (exp);

end iexp;

fexp: procedure (a, n) returns (float);

declare (a float, n fixed binary (31)) nonassignable;

declare exp float initial (a), i fixed binary;

if a = 0 & n = 0 then signal error;

if n = 0 then return (1);

do i = 2 to n;

exp = exp * a;

end;

return (exp);

end fexp;

</lang>