Shell Programming and Scripting

Ruby:

Code:

def fib( n )
  a, b = 0, 1
  n.times { a, b = b, a + b }
  b
end

9.times {|i| print i, ' ', fib(i), "\n" }

Hi,
you can try this script.i admit calculation part in while loop could be reduced to minimum.but this script will work.just adjust else part i have not considered if no of terms are less than 2.
this script will generate series upto the terms entered..

#!/usr/bin/ksh
typeset -u f[50]
f[0]=1
f[1]=1
echo "enter no of terms"
read n
echo "fibonaaci series upto $n terms"
if [ $n -gt 2 ]
then
i=2
echo ${f[0]}
echo ${f[1]}
while [ $i -lt n ]
do
k=`expr $i - 1`
j=`expr $i - 2`
a=${f[k]}
b=${f[j]}
f[i]=`expr $a + $b`
echo ${f[i]}
i=`expr $i + 1`
done
else
echo ${f[0]}
fi

try this

#!/usr/bin/ksh
typeset -i f[50]
f[0]=1
f[1]=1
echo "enter no of terms"
read n
echo "fibonaaci series upto $n terms"
if [ $n -gt 2 ]
then
i=2
echo ${f[0]}
echo ${f[1]}
while [ $i -lt n ]
do
f[i]=`expr ${f[i-1]}+${f[i-2]}`
echo ${f[i]}
i=`expr $i + 1`
done
else

echo ${f[0]}
echo ${f[1]}
fi

Thanx for the solutions trying them out tonight, then i'll try to figure out how they work. Just new to Unix and i'm trying to learn it because it seems so interesting but complicated at times, so once again thanx for your time and help

Dear All,

Am got febonaaci script example from our Fourm. While i was executing always am getting this "integer Expression Expected Error".

There is a Statement in that Script

while [ $i -lt n ] ----> always the error messge showed to this statement
do
k=`expr $i - 1`
j=`expr $i - 2`
a=${f[k]}
b=${f[j]}
f[i]=`expr $a + $b`
echo ${f[i]}
i=`expr $i + 1`
done

Can Any body Help me to Learn this kind of Issue.

Thank You

Nirmal Babu

Did you try $n??

i=1
a=0
b=1
echo ${a},
while [ $i != 10 ]
do
b=`expr $a + $b`
echo ${b},
c=$a
a=$b
b=$c
i=`expr $i + 1`
done