IEEE-754 calculation - best way?

[Biker1971]

Hello, I'm trying to calculate some values in the IEEE 754 format, incl. the restrictions of accuracy. For example, if I multiply 0.29 with 50, I get 14.5:

my $num1 = 0.29;
my $num2 = 50;
my $num3 = $num1 * $num2;
print "num3=$num3\n"; # is '14.5'

Only with this line:

my $num4 = sprintf ("%.64f", $num7);

I get the exact result in "double" (14.999...). Is there are way to enable to get the same result without the sprintf instruction? Also if I use "eval", the result differs from the IEEE-754 calculation. What I want to do is to calculate everything with IEEE-754 numbers ("double" in C).

my $num1 = 0.29;
my $num2 = sprintf ("%.64f", $num1);
my $num3 = 50;
my $num4 = sprintf ("%.64f", $num3);
my $num5 = $num2 * $num4;
my $num6 = sprintf ("%.64f", $num5);
my $num7 = $num1 * $num3;
my $num8 = sprintf ("%.64f", $num7);
my $num9 = eval(eval($num1) * eval($num3));
my $num10 = sprintf ("%.64f", $num9);

results in

num1=0.29
num2=0.2899999999999999800159855567471822723746299743652343750000...
num3=50
num4=50.000000000000000000000000000000000000000000000000000000000...
num5=14.5
num6=14.499999999999998223643160599749535322189331054687500000000...
num7=14.5
num8=14.499999999999998223643160599749535322189331054687500000000...
num9=14.5
num10=14.50000000000000000000000000000000000000000000000000000000...