WRITE A MENU DRIVEN PROGRAM TO CALUCULATE

 i)  Electricity bill ii) Telephone bill   by accepting number of units & rate per unit from user  (Use Function)  (For electricity bill,  if no. of units<100 then rate=0.5 Rs/unit,  if units>100 and <500 then rate=1.5 Rs/unit and if units>=500 then rate=2.00Rs/unit)  (For telephone bill, if no. of units<100 then rate=0.75 Rs./unit,  if units>100 and<500 then rate=1.25 Rs/unit and if units>=500 then rate=2.00Rs/unit)


#include<stdio.h>
void electricity()

{

int unit;

float bill;

printf("Enter number of units");

scanf("%d",&unit);

if(unit<100)

bill = unit * 0.5;

else if(unit > 100 && unit < 500)

bill = unit * 1.5;

else if(unit >= 500)

bill = unit * 2;

printf(" Electricity Bill = %f",bill);

}



void telephone()

{

int unit;

float bill;

printf("Enter number of units");

scanf("%d",&unit);

if(unit<100)

bill = unit * 0.75;

else if(unit > 100 && unit < 500)

bill = unit * 1.25;

else if(unit >= 500)

bill = unit * 2;

printf(" Electricity Bill = %f",bill);

}



void main()

{
int ch;

do
{

printf("\n1.Electricity\n2.Telephone\n3.Exit\nEnter your choice....");

scanf("%d",&ch);

switch(ch)

{

case 1:
electricity();

break;

case 2:
telephone();

break;

}

}while(ch!=3);

}