C++ Program for Electricity Billing Details

 #include<iostream>

#define r1 2.50

#define r2 3.50

#define r3 4.75

#define r4 6.50

using namespace std;

int main()

{

char name[20];

float units,charges,gst,amount;

    cout<<"\tElectricity Billing | If Else Ladder\n";

cout<<"Enter Your Name :";

cin.getline(name,20);

cout<<"Enter Units consumed :";

cin>>units;

if(units<=100)

charges=units*r1;

else if(units>100 && units<=300)

charges=(units-100)*r2+100*r1;

else if(units>300 && units<=600)

charges=(units-300)*r3+200+200*r2+100*r1;

gst=charges*0.05;

amount=charges+gst;

cout<<endl;

cout<<"============================\n";

cout<<"\t\tBILLING DETAILS\n";

cout<<"============================\n";

cout<<"CLient name            :"<<name<<endl;

cout<<"Units Consumed         :"<<units<<" Units"<<endl;

cout<<"Consumption Charges    :"<<charges<<endl;

cout<<"G.S.T. @ 5%            :"<<gst<<endl;

cout<<"Total Amount           :"<<amount<<endl;

cout<<"============================\n";

return 0;

}