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class mathslib_test extends \basic_testcase {
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class mathslib_test extends \basic_testcase {
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    /**
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    /**
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     * Tests the basic formula evaluation.
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     * Tests the basic formula evaluation.
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     */
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     */
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    public function test__basic() {
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    public function test__basic(): void {
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        $formula = new calc_formula('=1+2');
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        $formula = new calc_formula('=1+2');
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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        $this->assertSame($res, 3, '3+1 is: %s');
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        $this->assertSame($res, 3, '3+1 is: %s');
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    }
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    }
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    /**
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    /**
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     * Tests the formula params.
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     * Tests the formula params.
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     */
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     */
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    public function test__params() {
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    public function test__params(): void {
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        $formula = new calc_formula('=a+b+c', array('a'=>10, 'b'=>20, 'c'=>30));
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        $formula = new calc_formula('=a+b+c', array('a'=>10, 'b'=>20, 'c'=>30));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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        $this->assertSame(60, $res, '10+20+30 is: %s');
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        $this->assertSame(60, $res, '10+20+30 is: %s');
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    }
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    }
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    /**
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    /**
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     * Tests the changed params.
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     * Tests the changed params.
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     */
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     */
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    public function test__changing_params() {
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    public function test__changing_params(): void {
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        $formula = new calc_formula('=a+b+c', array('a'=>10, 'b'=>20, 'c'=>30));
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        $formula = new calc_formula('=a+b+c', array('a'=>10, 'b'=>20, 'c'=>30));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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    }
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    }
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    /**
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    /**
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     * Tests the spreadsheet emulation function in formula.
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     * Tests the spreadsheet emulation function in formula.
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     */
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     */
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    public function test__calc_function() {
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    public function test__calc_function(): void {
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        $formula = new calc_formula('=sum(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));
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        $formula = new calc_formula('=sum(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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        $this->assertSame(60, $res, 'sum(a, b, c) is: %s');
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        $this->assertSame(60, $res, 'sum(a, b, c) is: %s');
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    }
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    }
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    public function test_other_functions() {
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    public function test_other_functions(): void {
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        $formula = new calc_formula('=average(1,2,3)');
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        $formula = new calc_formula('=average(1,2,3)');
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        $this->assertSame(2, $formula->evaluate());
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        $this->assertSame(2, $formula->evaluate());
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        $formula = new calc_formula('=mod(10,3)');
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        $formula = new calc_formula('=mod(10,3)');
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        $this->assertSame(1, $formula->evaluate());
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        $this->assertSame(1, $formula->evaluate());
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        $formula = new calc_formula('=power(2,3)');
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        $formula = new calc_formula('=power(2,3)');
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        $this->assertSame(8, $formula->evaluate());
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        $this->assertSame(8, $formula->evaluate());
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    }
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    }
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        $formula = new calc_formula('=or(0,0,0)');
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        $formula = new calc_formula('=or(0,0,0)');
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        $this->assertSame(0, (int) $formula->evaluate());
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        $this->assertSame(0, (int) $formula->evaluate());
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    }
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    }
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    public function test_conditional_operators() {
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    public function test_conditional_operators(): void {
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        $formula = new calc_formula('=2==2');
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        $formula = new calc_formula('=2==2');
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        $this->assertSame(1, $formula->evaluate());
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        $this->assertSame(1, $formula->evaluate());
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        $this->assertSame(10, $formula->evaluate());
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        $this->assertSame(10, $formula->evaluate());
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    }
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    }
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    /**
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    /**
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     * Tests the min and max functions.
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     * Tests the min and max functions.
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     */
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     */
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    public function test__minmax_function() {
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    public function test__minmax_function(): void {
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        $formula = new calc_formula('=min(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));
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        $formula = new calc_formula('=min(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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        $this->assertSame(10, $res, 'minimum is: %s');
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        $this->assertSame(10, $res, 'minimum is: %s');
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        $formula = new calc_formula('=max(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));
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        $formula = new calc_formula('=max(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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    }
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    }
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    /**
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    /**
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     * Tests special chars.
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     * Tests special chars.
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     */
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     */
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    public function test__specialchars() {
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    public function test__specialchars(): void {
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        $formula = new calc_formula('=gi1 + gi2 + gi11', array('gi1'=>10, 'gi2'=>20, 'gi11'=>30));
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        $formula = new calc_formula('=gi1 + gi2 + gi11', array('gi1'=>10, 'gi2'=>20, 'gi11'=>30));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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        $this->assertSame(60, $res, 'sum is: %s');
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        $this->assertSame(60, $res, 'sum is: %s');
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    }
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    }
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    /**
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    /**
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     * Tests some slightly more complex expressions.
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     * Tests some slightly more complex expressions.
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     */
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     */
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    public function test__more_complex_expressions() {
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    public function test__more_complex_expressions(): void {
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        $formula = new calc_formula('=pi() + a', array('a'=>10));
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        $formula = new calc_formula('=pi() + a', array('a'=>10));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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        $this->assertSame(pi()+10, $res);
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        $this->assertSame(pi()+10, $res);
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    }
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    }
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    /**
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    /**
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     * Tests some slightly more complex expressions.
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     * Tests some slightly more complex expressions.
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     */
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     */
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    public function test__error_handling() {
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    public function test__error_handling(): void {
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        $formula = new calc_formula('=pi( + a', array('a'=>10));
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        $formula = new calc_formula('=pi( + a', array('a'=>10));
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        $res = $formula->evaluate();
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        $res = $formula->evaluate();
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        $this->assertFalse($res);
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        $this->assertFalse($res);
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        $this->assertSame($res, false);
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        $this->assertSame($res, false);
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        $this->assertSame(get_string('operatorlacksoperand', 'mathslib', '^'), $formula->get_error());
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        $this->assertSame(get_string('operatorlacksoperand', 'mathslib', '^'), $formula->get_error());
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    }
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    }
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    public function test_rounding_function() {
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    public function test_rounding_function(): void {
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        // Rounding to the default number of decimal places.
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        // Rounding to the default number of decimal places.
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        // The default == 0.
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        // The default == 0.
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        $formula = new calc_formula('=round(123.456, -1)');
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        $formula = new calc_formula('=round(123.456, -1)');
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        $this->assertSame(120.0, $formula->evaluate());
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        $this->assertSame(120.0, $formula->evaluate());
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    }
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    }
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    public function test_scientific_notation() {
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    public function test_scientific_notation(): void {
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        $formula = new calc_formula('=10e10');
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        $formula = new calc_formula('=10e10');
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        $this->assertEqualsWithDelta(1e11, $formula->evaluate(), 1e11 * 1e-15);
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        $this->assertEqualsWithDelta(1e11, $formula->evaluate(), 1e11 * 1e-15);
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        $formula = new calc_formula('=10e10^2');
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        $formula = new calc_formula('=10e10^2');
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        $this->assertEqualsWithDelta(1e22, $formula->evaluate(), 1e22 * 1e-15);
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        $this->assertEqualsWithDelta(1e22, $formula->evaluate(), 1e22 * 1e-15);
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    }
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    }
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    public function test_rand_float() {
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    public function test_rand_float(): void {
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        $formula = new calc_formula('=rand_float()');
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        $formula = new calc_formula('=rand_float()');
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        $result = $formula->evaluate();
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        $result = $formula->evaluate();