php BC high-precision function library_PHP tutorial
php BC high-precision function library
<!--?php *************************************************************************************** *php BC高精确度函数库 *php bc math 包含了:相加,比较,相除,相减,求余,相乘,n次方,配置默认小数点数目,求平方 *这些函数在涉及到有关金钱的计算时比较有用 **************************************************************************************** *************************************************************************************** *两个高精度数比较 *工作中遇到一种情况,0.00 != 0 *int bccomp ( string $left_operand , string $right_operand [, int $scale ] ) *$left=$right 返回 0 *$left<$right 返回 -1 *$left-->$right 返回 1 *$scale 小数点位数 *************************************************************************************** $a = 4.45; $b = 5.54; if(bccomp($a, $b, 2) == 0) { } *************************************************************************************** *两个高精度数相加 *string bcadd ( string $left_operand , string $right_operand [, int $scale ] ) *$scale 返回的小数点个数 *************************************************************************************** $a = 1.0321456; $b = 0.0123456; $c = bcadd($a, $b, 2); //var_dump($c); *************************************************************************************** *两个高精度数相减 *sstring bcsub ( string $left_operand , string $right_operand [, int $scale ] ) *$scale 返回的小数点个数 *************************************************************************************** $a = 1.0321456; $b = 3.0123456; $c = bcsub($a, $b, 2); var_dump($c); ******************************************************** *两个高精度数求余/取模 *string bcmod ( string $left_operand , string $modulus ) ******************************************************* $a = 6; $b = 4; $c = bcmod($a, $b); //var_dump($c); *************************************************************************************** *两个高精度数相除 *string bcdiv ( string $left_operand , string $right_operand [, int $scale ] ) *$scale小数点位数默认为 0 *************************************************************************************** $a = 6; $b = 5; $c = bcdiv($a, $b, 3); //var_dump($c); *************************************************************************************** *两个高精度数相乘 *string bcmul ( string $left_operand , string $right_operand [, int $scale ] ) *$scale小数点位数默认为 0 *************************************************************************************** $a = 3.1415926; $b = 2.4569874566; $c = bcmul($a, $b, 6); //var_dump($c); *************************************************************************************** *两个高精度数的次方值 *string bcpow ( string $left_operand , string $right_operand [, int $scale ] ) *$scale小数点位数默认为 0 *************************************************************************************** $a = 3.1415926; $b = 2; $c = bcpow($a, $b, 3); //var_dump($c); ************************************************** *求高精度数的平方根 *string bcsqrt ( string $operand [, int $scale ] ) *$scale小数点位数默认为 0 *************************************************** $b = bcsqrt($a, 6); //var_dump($b); ****************************** *设置bc函数的小数点位数 *bool bcscale ( int $scale ) *$scale小数点位数默认为 0 ****************************** //bcscale(); ?>

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Go language provides two dynamic function creation technologies: closure and reflection. closures allow access to variables within the closure scope, and reflection can create new functions using the FuncOf function. These technologies are useful in customizing HTTP routers, implementing highly customizable systems, and building pluggable components.

In C++ function naming, it is crucial to consider parameter order to improve readability, reduce errors, and facilitate refactoring. Common parameter order conventions include: action-object, object-action, semantic meaning, and standard library compliance. The optimal order depends on the purpose of the function, parameter types, potential confusion, and language conventions.

The key to writing efficient and maintainable Java functions is: keep it simple. Use meaningful naming. Handle special situations. Use appropriate visibility.

1. The SUM function is used to sum the numbers in a column or a group of cells, for example: =SUM(A1:J10). 2. The AVERAGE function is used to calculate the average of the numbers in a column or a group of cells, for example: =AVERAGE(A1:A10). 3. COUNT function, used to count the number of numbers or text in a column or a group of cells, for example: =COUNT(A1:A10) 4. IF function, used to make logical judgments based on specified conditions and return the corresponding result.

The advantages of default parameters in C++ functions include simplifying calls, enhancing readability, and avoiding errors. The disadvantages are limited flexibility and naming restrictions. Advantages of variadic parameters include unlimited flexibility and dynamic binding. Disadvantages include greater complexity, implicit type conversions, and difficulty in debugging.

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