Scripting Classroomnotes 09/Dec/2022

Instruct ELSA to find the number is pallendrome or not

• Logic:
  
• Instructions:

1. Remember input as number and temp_number
2. reverse = 0
3. last_digit = number%10 
4. reverse = last_digit + reverse * 10
5. number = number/10 
6. go to step 3 if number != 0
7. say reverse
8 if reverse == temp_number say pallendrome 

BASH

• To Remember

number=5
name='shell'

• To say

echo ${number}
echo $name

• Lets convert the above instructions to ELSA to BASH
• Note: Not all instructions will be convert
• Integer Operators in bash. Refer Here

# 1. Remember input as number and temp_number
number=121
temp_number=$number
#2. reverse = 0
reverse=0
# 3. last_digit = number%10
last_digit=$(( $number%10 ))
# 4. reverse = last_digit + reverse * 10
reverse=$(( $last_digit + $reverse*10 ))
5. number = number/10 
number=$(( number/10 ))
# 6. go to step 3 if number != 0
# todo: need to figure out
#7. say reverse
echo $reverse
#8 if reverse == temp_number say pallendrome 
# todo: need to figure out

Exercise

• Try speaking the above with the following
  • POWERSHELL
    • declaration $number = 5
    • + - * / %
    • expression $number = $number * 10 + 5
  • PYTHON
    • declartion number = 5
    • + - * // %
    • expression number = number * 10 + 5