CALCULATING TELEPHONE BILL

Aim:

To write a shell script program to print the bill for the customer of telephone  
 company at the following rates:

For the first 50 calls rate — Rs. 25 (fixed rate)
For next 100 calls — Rs. 6 (per 10 calls)
For next 200 calls — Rs. 7 (per 10 calls)
For more than 350 calls — Rs. 8 (per 5 calls)

Algorithm:

1.Enter the number of calls.
2.If the number of calls are less than 25, initialize sum = 25, else if the call I
number is between 51 and 150, calculate sum 1 = call * 0.6 else if the I
number of calls are between 151 and 350, calculate sum 2 = call * 0.7 else I
calculate for Rupees 8.
3.Display the result.

Program:

#Telephone Bill

while test ch

do

echo Telephone Bill

echo “*********“

read call
if test $call le 50

then

sum 25

echo “charge” $sum
elif test $call -gt 51 && test $call -le 150

then

sum1 = ‘echo sum + $call \* 0.6 bc’

echo “charge” $suml
elif test $call -gt 151 && test $call -le 250

then

sum2 = ‘echo sum + $call \* 0.7 I bc’
echo “charge” $sum2
else
sum3 = ‘echo $sum2 + $call \ * 0.4 I bc’
echo “charge” $sum3
fi
echo “do you want to continue(y/n)”
read ch

done

Output:
 Telephone Bill
  * ** * * * ** *
   Enter the number of calls
 27
 Charge 25

Result:
Thus the program is written and executed to print the telephone Bill.