浮点运算(floating point arithmetic)就是实数运算,因为计算机只能存储整数,所以实数都是约数,这样浮点运算是很慢的而且会有误差。大多数机器都是32位的,也就是说32位都用来表示整数的话,那么对于无符号整数就是0 到 2^32-1,对于有符号的话就是-2^31 到 2^31-1。基本特征当我们用不同的电脑计算圆周率时,会...
However, you can perform floating-point arithmetic using external tools. Here we will walk through few methods to handle floating-point numbers in bash. Continue reading → Posted in Tips and tricks, Tutorials | Tagged awk, bc, float, number ...
The Linux Bash shell only supports integer arithmetic and cannot perform calculations on floating point numbers. The bc utility in Linux allows for precision floating point calculations interactively and in shell scripts. Using bc, you can set the number of decimal places to display and perform ...
计算浮点数的另一种方法是使用AWK rounding功能，例如：如果你不需要浮点精度，你可以简单地去掉小数部分。
17. Arithmetic Operations 17.1. Bash Addition Calculator Example #!/bin/bash let RESULT1=$1+$2 echo $1+$2=$RESULT1 ' -> # let RESULT1=$1+$2' declare -i RESULT2 RESULT2=$1+$2 echo $1+$2=$RESULT2 ' -> # declare -i RESULT2; RESULT2=$1+$2' ...
All numbers are represented internally as fixed-width integers. (Bash does not support floating-point arithmetic.)No overflow checking is performed, so operations on large integers may produce an unexpected result, without causing an error.Division by zero is detected, however, and causes an error...
Unlike bash’s arithmetic, it can handle floating point numbers: >math5 / 22.5 And also has some functions, like for trigonometry: >mathcos 2 x pi1 You can pass arguments tomathseparately like above or in quotes. Because fish uses()parentheses forcommand substitutions, quoting is needed if...
Apart from the floating point operations, you can also use it in the terminal forarithmetic operations. In this tutorial, I will cover both ways to use the bc command: in the bash script and in the terminal window. How to use the bc command in Linux ...
Thus, you can perform floating point math in bash through the bc command. 2. PERL The Perl language does not require compiling; instead, it allows platform-independent code. You can also perform arithmetic of floating numbers in bash with the help of Perl, which supports language features like...
To measure elapsed time with millisecond resolution, usedatewith+%s.%3Noption, which returns the current time in milliseconds. Since bash does not supportfloating point arithmetic, you need to rely on an external calculator tool such asbcto compute time difference with millisecond resolution. Thebc...