bc arbitrary precision calculator language command is usually used as a calculator at linux. It is similar to the basic calculator, use this calculator can do basic math.
Note: Enter quit to exit the command.
grammar:
bc(选项)(参数)Option Value
- -i: forced into interactive mode;
- -l: the standard math library definitions used
- ; -W: extended POSIX bc given a warning;
- -q: Do not print the normal GNU bc environmental information;
- -v: show version command information;
- -h: displays help information instruction.
parameter
File: Specifies the file that contains the computing tasks.
Common operations:
- + Addition
- - Subtraction
- * Multiplication
- / Division
- ^ Index
- % remainder
Note: The default calculation conforming to different mixing stages when you calculate parentheses calculated (/ need extra attention or%), such as: 2 + 2 + 5 = 10 * (5 * 10) = 52
E.g
1, the conventional computing
[hern@hern ~]$ echo "1+2+3" |bc
6
[hern@hern ~]$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
1+2+3 #<==只有加法时
6 #<==输出结果
7-8+3 #<==加法与减法混合时
2
10*5+2 #<==乘法与加法混合
52
10%3 #<==余数计算
1
10^2 #<==平方计算
100
10/100 #<==除数取整
0
2+5*10 #<==加法与乘法混合时
52
2, several setting (scale by setting) after the decimal point is output:
[hern@hern ~]$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
scale=3 #<==设置输出小数点后3位
1/3
.333 #<==输出小数点后3位
340/2349
.144
quit
[hern@hern ~]$ echo "scale=2;(2.77-1.4744)/1" |bc
1.29
3, ibase to hexadecimal arithmetic and obase
[hern@hern ~]$ echo "ibase=2;111" |bc #<==输出二进制111的结果
7
