Write a program that inputs the current reading and previous reading of electric meter. It finds out the total units consumed using nested ‘if-else’ structure and computes the electricity bill as follows:
// If units consumed are less than or equal to 300, then rate of electricity is Rs.12 per unit.
// If units consumed are more than 300 and less than or equal to 400, then rate of electricity is Rs.14 per unit.
// If units consumed are more than 400, then rate of electricity is Rs.20 per unit.

We learn Programming to solve problems using Computers. A Computer Program is the set of instructions that are given to a computer so that it can solve problems. To solve problems is our primary goal in Computer Science.

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Any instruction that is written in High-Level Language i.e. C++ or C is known as Source Code.

What is Object Code?

Any Code that is written in Low-Level Language i.e. Assembly Language or Binary Language is known as Object Code.

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So let’s Write Code:

Write a program that inputs the current reading and previous reading of electric meter. It finds out the total units consumed using nested ‘if-else’ structure and computes the electricity bill as follows:
// If units consumed are less than or equal to 300, then rate of electricity is Rs.12 per unit.
// If units consumed are more than 300 and less than or equal to 400, then rate of electricity is Rs.14 per unit.
// If units consumed are more than 400, then rate of electricity is Rs.20 per unit.

#include"iostream"
using namespace std;
main()
{
unsigned int previous, current, units, bill;

cout<<"Enter previous reading ? ";
cin>>previous;
cout<<"Enter current reading ? ";
cin>>current;
units = current - previous;
if (units > 400)
bill = units * 20;
else if (units> 300)
bill = units * 14;
else if (units <= 300)
bill = units * 12;
cout << "Total units :"<<units<<endl;
cout << "Electricity bill :"<<bill;
}

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