Scientific Calculator Using awk Command in Linux

The awk command in Linux allows the user to use the numeric functions, variables, logical operators and string functions. Basically, it is a utility that allows the user to write small and effective programs in the form the statements. It is mostly used in pattern scanning and processing. Here, we are using the awk command to perform the following operations:

• Floating-point calculations
• Trigonometric operations
• Logarithms
• Exponent

Syntax for awk Command

awk options 'pattern{action }' input-file > output-file

Program: Here, we are using Ubuntu. We are saving the below program in file named scientificcalculator.sh. To execute this program, you can use the below command:

sh  scientificcalculator.sh

pi=`echo "scale=10;4*a(1)" | bc -l`

while true
do

cat << MENU

      Menu:
    a) Floating Point Calculations
    b) Trigonometric Operations
    c) Logarithmic Operations
    d) Exponential Operations

MENU
echo '
Enter your Choice: \c'
read choice

case $choice in

    a)  echo "\nEnter expression: "
        read exp
        cal()
            awk "BEGIN{print $*}";
        echo "Answer: " `cal $exp`
        ;;

    b)  echo "\nEnter Trigonometric function : "
            read exp
            echo "Degree: "
            read degree

         e=$(awk "BEGIN{print $exp($degree*atan2(0,-1)/180)}")
            echo "
            $exp($degree)= $e"
            ;;

        c)  echo "\nEnter the logarithmic value: "
            read value
            echo $value | awk '{printf "%11.9f\n",log($1)/log(10)}'
            ;;

        d)  echo "\nEnter the base number x: "
        read x
        echo "Enter exponent number y: "
        read y
        E=$(echo "$x 1" | awk "{print (($x/1)^$y)}")
        echo "$x^$y = $E"
            ;;
        *)
              break;;
          *)
              break;;
esac
done

Output: