regcomp.c: Rename a variable

[perl5.git] / t / op / exp.t

diff --git a/t/op/exp.t b/t/op/exp.t
old mode 100755 (executable)
new mode 100644 (file)
index 5efc9ba..5878f44
--- a/t/op/exp.t
+++ b/t/op/exp.t
@@ -1,27 +1,121 @@
 #!./perl
 
-# $RCSfile: exp.t,v $$Revision: 4.1 $$Date: 92/08/07 18:27:50 $
+# Simple tests for the basic math functions.
 
-print "1..6\n";
+BEGIN {
+    chdir 't' if -d 't';
+    require './test.pl';
+    set_up_inc('../lib');
+}
+
+use Config;
+
+plan tests => 31;
 
 # compile time evaluation
 
+eval { $s = sqrt(-1) }; # Kind of compile time.
+like($@, qr/sqrt of -1/, 'compile time sqrt(-1) fails');
+
+$s = sqrt(0);
+is($s, 0, 'compile time sqrt(0)');
+
+$s = sqrt(1);
+is($s, 1, 'compile time sqrt(1)');
+
 $s = sqrt(2);
-if (substr($s,0,5) eq '1.414') {print "ok 1\n";} else {print "not ok 1\n";}
+is(substr($s,0,5), '1.414', 'compile time sqrt(2) == 1.414');
+
+$s = exp(0);
+is($s, 1, 'compile time exp(0) == 1');
 
 $s = exp(1);
-if (substr($s,0,7) eq '2.71828') {print "ok 2\n";} else {print "not ok 2\n";}
+is(substr($s,0,7), '2.71828', 'compile time exp(1) == e');
+
+eval { $s = log(0) };  # Kind of compile time.
+like($@, qr/log of 0/, 'compile time log(0) fails');
 
-if (exp(log(1)) == 1) {print "ok 3\n";} else {print "not ok 3\n";}
+$s = log(1);
+is($s, 0, 'compile time log(1) == 0');
+
+$s = log(2);
+is(substr($s,0,5), '0.693', 'compile time log(2)');
+
+cmp_ok(exp(log(1)), '==', 1, 'compile time exp(log(1)) == 1');
+
+cmp_ok(round(atan2(1, 2)), '==', '0.463647609', "atan2(1, 2)");
 
 # run time evaluation
 
+$x0 = 0;
 $x1 = 1;
 $x2 = 2;
+
+eval { $s = sqrt(-$x1) };
+like($@, qr/sqrt of -1/, 'run time sqrt(-1) fails');
+
+$s = sqrt($x0);
+is($s, 0, 'run time sqrt(0)');
+
+$s = sqrt($x1);
+is($s, 1, 'run time sqrt(1)');
+
 $s = sqrt($x2);
-if (substr($s,0,5) eq '1.414') {print "ok 4\n";} else {print "not ok 4\n";}
+is(substr($s,0,5), '1.414', 'run time sqrt(2) == 1.414');
+
+$s = exp($x0);
+is($s, 1, 'run time exp(0) = 1');
 
 $s = exp($x1);
-if (substr($s,0,7) eq '2.71828') {print "ok 5\n";} else {print "not ok 5\n";}
+is(substr($s,0,7), '2.71828', 'run time exp(1) = e');
+
+eval { $s = log($x0) };
+like($@, qr/log of 0/, 'run time log(0) fails');
+
+$s = log($x1);
+is($s, 0, 'compile time log(1) == 0');
+
+$s = log($x2);
+is(substr($s,0,5), '0.693', 'run time log(2)');
+
+cmp_ok(exp(log($x1)), '==', 1, 'run time exp(log(1)) == 1');
+
+# NOTE: do NOT test the trigonometric functions at [+-]Pi
+# and expect to get exact results like 0, 1, -1, because
+# you may not be able to feed them exactly [+-]Pi given
+# all the variations of different long doubles.
+
+my $pi_2 = 1.5707963267949;
+
+sub round {
+   my $result = shift;
+   return sprintf("%.9f", $result);
+}
+
+# sin() tests
+cmp_ok(sin(0), '==', 0.0, 'sin(0) == 0');
+cmp_ok(abs(sin($pi_2) - 1), '<', 1e-9, 'sin(pi/2) == 1');
+cmp_ok(abs(sin(-1 * $pi_2) - -1), '<', 1e-9, 'sin(-pi/2) == -1');
+
+cmp_ok(round(sin($x1)), '==', '0.841470985', "sin(1)");
+
+# cos() tests
+cmp_ok(cos(0), '==', 1.0, 'cos(0) == 1');
+cmp_ok(abs(cos($pi_2)), '<', 1e-9, 'cos(pi/2) == 0');
+cmp_ok(abs(cos(-1 * $pi_2)), '<', 1e-9, 'cos(-pi/2) == 0');
+
+cmp_ok(round(cos($x1)), '==', '0.540302306', "cos(1)");
+
+cmp_ok(round(atan2($x1, $x2)), '==', '0.463647609', "atan2($x1, $x2)");
+
+# atan2() tests testing with -0.0, 0.0, -1.0, 1.0 were removed due to
+# differing results from calls to atan2() on various OS's and
+# architectures.  See perlport.pod for more information.
 
-if (exp(log($x1)) == 1) {print "ok 6\n";} else {print "not ok 6\n";}
+SKIP: {
+    unless ($Config{usequadmath}) {
+        skip "need usequadmath", 1;
+    }
+    # For quadmath we have a known precision.  
+    is(sqrt(2), '1.4142135623730950488016887242097', "quadmath sqrt");
+}