Write a C program to input electricity unit charge and calculate the total electricity bill according to the given condition:

For first 50 units Rs. 0.50/unit

For next 100 units Rs. 0.75/unit

For next 100 units Rs. 1.20/unit

For unit above 250 Rs. 1.50/unit

An additional surcharge of 20% is added to the bill.

How to calculate electricity bill using if else in C programming. Program to find electricity bill using if else in C. Logic to find net electricity bill in C program.

## Required knowledge

Basic C programming, Relational operators, If else

## Logic to calculate net electricity bill

Step by step descriptive logic to compute electricity bill.

- Input unit consumed by customer in some variable say
`unit`. - If unit consumed less or equal to
`50`units. Then`amt = unit * 0.50`

. - If unit consumed more than
`50`units but less than`100`units. Then add the first`50`units amount i.e.`25`to final amount and compute the rest`50`units amount. Which is given by`amt = 25 + (unit-50) * 0.75`

. I have used`units-50`

, since I already calculated first`50`units which is`25`. - Similarly check rest of the conditions and calculate total amount.
- After calculating total amount. Calculate the surcharge amount i.e.
`sur_charge = total_amt * 0.20`

. Add surcharge amount to net amount. Which is given by`net_amt = total_amt + sur_charge`

.

Let us now code the solution for the given program.

## Program to calculate electricity bill

```
/**
* C program to calculate total electricity bill
*/
#include <stdio.h>
int main()
{
int unit;
float amt, total_amt, sur_charge;
/* Input unit consumed from user */
printf("Enter total units consumed: ");
scanf("%d", &unit);
/* Calculate electricity bill according to given conditions */
if(unit <= 50)
{
amt = unit * 0.50;
}
else if(unit <= 150)
{
amt = 25 + ((unit-50) * 0.75);
}
else if(unit <= 250)
{
amt = 100 + ((unit-150) * 1.20);
}
else
{
amt = 220 + ((unit-250) * 1.50);
}
/*
* Calculate total electricity bill
* after adding surcharge
*/
sur_charge = amt * 0.20;
total_amt = amt + sur_charge;
printf("Electricity Bill = Rs. %.2f", total_amt);
return 0;
}
```

**Note:** `%.2f`

is used to print fractional values only up to 2 decimal places. You can also use `%f`

to print fractional values normally up to six decimal places.

Output

Enter total units consumed: 150 Electricity Bill = Rs. 120.00

Happy coding 😉

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