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Bash program to find A to the power B
  • Difficulty Level : Medium
  • Last Updated : 02 Feb, 2018


Given two number A and B write a shell script to find the value of AB .

Examples:

Input : 
2 4
Output :
2 to the power 4 is 16

Input :
1 0
Output :
1 to the power 0 is 1

Approach

A to the power B (AB) means multiplying A, B times. Using a naive approach to solve this problem.
For Example:-
A = 2 and B = 3
A3 = 8 which comes by multiplying 2 3 times i.e. 2*2*2 = 8 .

BASH




# Bash Program to find
# A to the power B
  
# Subroutine to find A
# to the power B
pow()
{
  # value of A
  a=$1
  
  # value of B
  b=$2
  
  # c to count counter
  c=1
  
  # res to store the result
  res=1
  
  #
  if((b==0));
  then
    res=1
  fi
  
  if((a==0));
  then
    res=0
  fi
  
  if((a >= 1 && b >= 1));
  then
    while((c <= b))
    do
      res=$((res * a))
      c=$((c + 1))
    done
  fi
  
  # Display the result
  echo "$1 to the power $2 is $res"
}
  
# Driver Code
  
# input
A=2
B=4
  
# calling the pow function
pow $A $B

Output:

16
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