BC计算器用法【转】

1.bc计算平方和2的n次方
#!/bin/bash
square()
{
echo "square of $1 is \c"
echo "$1*$1"|bc
}
########################
cube()
{
echo "cube of $1 is \c"
echo "2^$1"|bc
}
#######################
power()
{
echo "raising 2 to the power of $1 is \c"
}

while getopts s:c:p: option
do
case $option in
s)square $OPTARG;;
c)cube $OPTARG;;
p)power $OPTARG;;
esac
done 

2.bc进制转换，小数点精度
[/root#]a=12 

[/root#]b=23 

[/root#]echo "$a+$b"|bc 35 [/root#]echo "$a*$b"|bc 

276 [/root#]a=12.34 

[/root#]b=23.45 

[/root#]echo "scale=1;$a*$b"|bc 289.37 

[/root#]echo "scale=1;$a/$b"|bc #保留小数点精度只对除法有效 

.5 [/root#]echo "scale=2;$a/$b"|bc .52 

[/root#]echo "obase=16;123"|bc #10进制123转换成16进制 

7B [/root#]echo "obase=2;123"|bc #转换成2进制 

1111011