#!/bin/bash
#Author: Rajesh
#Veresion: 1.2 (Version 1.1 did not have square and square root options)
# This script will perform simple arithematic operations including decimal numbers.
echo -e "Choose Option: \n 1: For Addition, Subtraction, Multiplication and Division of TWO numbers. \n 2: For Square and Square Root of A number"
read OPTION
if [ "$OPTION" -eq 1 ] # Start of the outer loop. The main LOOP.
then
echo "Enter First Number. Decimals are accepted"
read FIRST_NUM
sleep 1
echo "Enter Second Number. Decimals are accepted"
read SECOND_NUM
sleep 2
echo -e "What operation would you like to perform.\n Enter A OR a for Addition, S OR s for Substraction, M OR m for multiplication, D OR d for division."
read INPUT
sleep 2
CHOICE=${INPUT^^} # This converts the input to uppercase so you only have to compare one letter.
if [ "$CHOICE" = "A" ] # Start of the first inner loop
then
SUM=$(echo "scale=2; $FIRST_NUM+$SECOND_NUM" | bc)
#Since bash is weak with floating numbers, tools like bc have to be used to get decimal values.#Hopefully its installed on your system. "yum install -y bc" in-case you were wondering.
echo -e "The sum of numbers you entered is:\n $SUM"
elif [ "$CHOICE" = "S" ]
then
SUB=$(echo "scale=2; $FIRST_NUM-$SECOND_NUM" | bc)
echo -e "The difference of numbers you entered is:\n $SUB"
elif [ "$CHOICE" = "M" ]
then
MUL=$(echo "scale=2; $FIRST_NUM*$SECOND_NUM" | bc)
echo -e "The product of numbers you entered is:\n $MUL"
elif [ "$CHOICE" = "D" ]
then
DIV=$(echo "scale=2; $FIRST_NUM/$SECOND_NUM" | bc)
echo -e "The division of numbers you entered is:\n $DIV"
else
echo -e "You did not choose a right option.\n sleep 1 Exiting the program ......."
sleep 1
fi # The first inner loop finishes here
elif [ "$OPTION" = 2 ] # The outer loop continues
then
echo "Enter SQ or sq for Square, SR or sr for Square Root"
read INPUT2
sleep 1
echo "Enter a number"
read NUM
CHOICE2=${INPUT2^^}
if [ "$CHOICE2" = "SQ" ] # Start of the second inner loop
then
SQUARE=$(echo "scale=2; $NUM*$NUM" | bc)
echo -e "The square of the number you entered is:\n $SQUARE"
elif [ "$CHOICE2" = "SR" ]
then
SQROOT=$(echo "scale=2; sqrt($NUM)" | bc)
echo -e "The square root of the number you entered is:\n $SQROOT"
else
echo -e "You did not choose a right option.\n sleep 1 Exiting the program ......."
fi # The second inner loop finishes here
else
echo -e "You did not choose a right option.\n sleep 1 Exiting the program ......."
fi # The main loop finally ends
