$f = Formula('x^2 + 1')
$g = Formula (x^3-2*x+1")
In webwork documentation in webwork wiki both are used. I know that in Python both ' ' and " " are used for strings.
Hi Ravinder,
In Perl, single quotes are for literal strings. For example, in Perl if you use single quotes to write
$a = 8;
$b = 'The value is $a.';
print $b; # print works in Perl, not PG
you will see
The value is $a.
Double quotes in Perl allow for scalar and array variable substitution. So, in Perl if you use double quotes to write
$a = 8;
$b = "The value is $a.";
print $b; # print works in Perl, not PG
you will see
The value is 8.
What does this mean for PG and, in particular, MathObjects? Pretty much the same thing: double quotes allow for variable substitution while single quotes do not. For example,
$a = 8;
$b = Compute('$a'); # should cause an error, though I did not test it
while
$a = 8;
$b = Compute("$a"); # creates a MathObject Real(8).
Good luck and keep the questions coming!
Paul Pearson
In Perl, single quotes are for literal strings. For example, in Perl if you use single quotes to write
$a = 8;
$b = 'The value is $a.';
print $b; # print works in Perl, not PG
you will see
The value is $a.
Double quotes in Perl allow for scalar and array variable substitution. So, in Perl if you use double quotes to write
$a = 8;
$b = "The value is $a.";
print $b; # print works in Perl, not PG
you will see
The value is 8.
What does this mean for PG and, in particular, MathObjects? Pretty much the same thing: double quotes allow for variable substitution while single quotes do not. For example,
$a = 8;
$b = Compute('$a'); # should cause an error, though I did not test it
while
$a = 8;
$b = Compute("$a"); # creates a MathObject Real(8).
Good luck and keep the questions coming!
Paul Pearson