From: "Robert Prins" <robert.ah.pr...@gmail.com>
Sent: Monday, September 07, 2020 3:42 AM


On 2020-09-06 13:07, Paul Gilmartin wrote:
On Sun, 6 Sep 2020 17:25:45 +1000, Robin Vowels wrote:

Beware!  Than might left-associate as:
     volume = ( 4/3 ) * 3.14159 * radius**3
... and the quotient of integers, 4/3, is 1.

No it's not. 4/3 yields 1.33333333333333.. to 15 digits in PL/I.
You're thinking of FORTRAN.

And C:
662 $ cat typetest.c
#include <stdio.h>
int main() {
     printf( "%10.6f\n",   4/3 * 3.14159 );
     printf( "%10.6f\n", 4.0/3 * 3.14159 ); }
663 $ gmake typetest &&amp; ./typetest
cc     typetest.c   -o typetest
   3.141590
   4.188787

It ought to depend on the types of the operands of the polymorphic
operator, '/'.  What are the default types of '4' and '3'?  Does PL/I
entirely lack an integer divide?

No,

Yes it does.
In an earlier letter, I pointed out that when both integer operands
for division are of the same type and are of maximum precision
PL/I produces an integer result.

if the receiving variable is an integer without fractional part, PL/I truncates.

Yes, it can do that too.

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