skp lab

q1
#!/bin/bash

echo "Enter the coefficients of the quadratic equation (a, b, c): "
read a b c

# calculate the discriminant
d=$(echo "scale=2; ($b*$b) - (4*$a*$c)" | bc)

# calculate the roots
if (( $(echo "$d > 0" | bc -l) )); then
  root1=$(echo "scale=2; (-$b + sqrt($d)) / (2 * $a)" | bc)
  root2=$(echo "scale=2; (-$b - sqrt($d)) / (2 * $a)" | bc)
  echo "Roots are: $root1 and $root2"
elif (( $(echo "$d == 0" | bc -l) )); then
  root1=$(echo "scale=2; -$b / (2 * $a)" | bc)
  echo "Root is: $root1"
else
  echo "Roots are complex numbers."
fi


q2
#!/bin/bash
read -p "Enter a number" n
rev=0
alt=$n
while [ $alt -gt 0 ]
do
    temp=$(( alt%10 ))
    rev=$(( $rev*10+$temp ))
    alt=$(( alt/10 ))
done
if [ $rev -eq $n ]
then
    echo "$n is a palindrome number"
else
    echo "$n is not a palindrom number"
fi

q3
#!/bin/bash
read -p "Enter name " name
read -p "Enter rol number " roll_no
read -p "Enter marks " marks
echo -e "Student report\n Name: $name\n Roll Number: $roll_no\n Marks:$marks"

q4
#!/bin/bash
read -p "Enter the radius of the circle in mm " r
area=$(echo "scale=3;(3.14*$r*$r)" | bc)
circum=$(echo "scale=3;(2*3.14*$r)" | bc)
echo -e  "Radius is $r\nCircumference is $circum mm\nArea is $area mm^2"

q5
#!/bin/bash
read -p "Enter a string " s
rev=""
l=${#s}
while [ $l -gt 0 ]
do
    add=${s:(l-1):1}
    rev="${rev}${add}"
    l=$(( l-1 ))
done
if [ $s = $rev ]
then
    echo "$s is a palindrome string"
else
    echo "$s is not a palindrome string"
fi