bcscale()函数是PHP中的内置函数。它为所有bc数学函数调用设置默认比例参数。当我们在程序中调用函数bcscale()时,在这个函数中传递的参数就变成了默认的比例因子,默认情况下是零。
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语法:
int bcscale($scale)
参数: 此函数只接受一个参数 美元规模 并且是int类型,是必需的。此参数表示所有bc数学函数的函数调用结果中小数点后出现的位数。其默认值为零。
返回值: 此函数返回旧的比例值。
下面的程序演示了PHP中的bcscale()函数:
项目1:
<?php // default scale : 3 bcscale(3); // takes the default scale value as 3 // which is declared at the beginning echo bcadd ( '111' , '6.55957' ), "" ; // 16.007 // this is not the same without bcscale() echo bcadd ( '111' , '6.55957' , 1), "" ; // 16.007 // takes the default scale value as 3 // which is declared at the beginning echo bcadd ( '111' , '6.55957' ), "" ; ?> |
输出:
117.559 117.5 117.559
项目2:
<?php // default scale : 3 bcscale(5); // takes the default scale value as 3 // which is declared at the beginning echo bcadd ( '111' , '6.55957' ), "" ; // 16.007 // this is not the same without bcscale() echo bcadd ( '111' , '6.55957' , 1), "" ; // 16.007 // default scale value changes bcscale(2); // takes the default scale value as 2 // which is declared echo bcadd ( '111' , '6.55957' ), "" ; ?> |
输出:
117.55957 117.5 117.55
参考: http://php.net/manual/en/function.bcscale.php
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