Question

1.        Write a shell script “6-1.sh” to calculate the exponentiation using while loop. This script needs to take two inputs like “6-1.sh a b”, and outputs the result of “a^b”. Note: You need to implement it, DO NOT use the exponentiation operation provided by the Linux.

2.        Write a shell script “6-2.sh” to calculate the factorial of a number using while loop. This script needs to take one input like “6-2.sh a”, and outputs the result of “a!”.

Answer 1

Exponential.sh

# to calculate the power of a number
a=4
b=3
count=1
ans=1
  
if[ $b -eq 0 ]
then
ans=1
fi
  
if[ $a -eq 0 ]
then
ans=0
fi
  
if[ $a -ge 1 -a $b -ge 1 ]
then
while[ $count -le $b ]
do
ans= `expr $ans \* a`
count= `expr $count + 1`
done
fi
echo "The Result is $ans"
}

Factorial.sh

# to calculate the factorial of a number
n=$1
a=n
fact=1
while [ $a -gt 1 ]
do
fact=`expr $fact\* $a`
a=’expr $a – 1’
done
echo "Result is $fact"