Thread: Need to Finish this Problem, not sure whats next

So I am designing a simple program. You input a bunch of numbers to compare a hybrid car and its costs vs a normal car and its costs. I am stuck on these two things.

AS OUTPUTS
1.A label indicating whether the car is Hybrid or Non-Hybrid
2. If the users criteria is "Gas", then print the output for the car with the lower gas consumption first. If the criteria is "Total", then print the output for the car with the lowest total cost first.

Code:

#include <iostream>
#include <string>
using namespace std;
 
 
int main() {
 
 
int miles_per_year;
double gallon_gas;
double hybrid_cost;
int hybrid_mpg;
double hybrid_resale;
double cost_nonhybrid;
int non_hybrid_mpg;
double nonhybrid_resale;
double fuel_five_years; 
double total_gallons;
double total_cost;
double depreciation;
double fuel_five_years_hybrid; 
double total_gallons_hybrid;
double total_cost_hybrid;
double depreciation_hybrid;


 
    cout <<"Please answer the following questions.\n" << endl;
     
do
{
    cout <<"The estimated miles driven per year?" << endl;
    cin >> miles_per_year;
if(miles_per_year < 0)
    cout <<"Please enter a positive value." << endl;
} while(miles_per_year < 0);
 
 
do
{
    cout <<"The estimated price of a gallon of gas?" << endl;
    cin >> gallon_gas;
if(gallon_gas < 0)
    cout <<"Please enter a positive value." << endl;
} while(gallon_gas < 0);
 
 
do
{
    cout <<"The cost of a hybrid car?" << endl;
    cin >> hybrid_cost;
if(hybrid_cost < 0)
    cout <<"Please enter a positive value." << endl;
} while(hybrid_cost < 0);
 
 
do
{
    cout <<"The efficiency of the hybrid car in miles per gallon?" << endl;
    cin >> hybrid_mpg;
if(hybrid_mpg < 0)
    cout <<"Please enter a positive value." << endl;
} while(hybrid_mpg < 0);
 
 
do
{
    cout <<"The estimated resale value for a hybrid after 5 years?" << endl;
    cin >> hybrid_resale;
if(hybrid_resale < 0)
    cout <<"Please enter a positive value." << endl;
} while(hybrid_resale < 0);
 
 
do
{
    cout <<"The cost of a non-hybrid car?" << endl;
    cin >> cost_nonhybrid;
if(cost_nonhybrid < 0)
    cout <<"Please enter a positive value." << endl;
} while(cost_nonhybrid < 0);
 
 
do
{
    cout <<"The efficiency of the non-hybrid car in miles per gallon?" << endl;
    cin >> non_hybrid_mpg;
if(non_hybrid_mpg < 0)
    cout <<"Please enter a positive value." << endl;
} while(non_hybrid_mpg < 0);
 
 
do
{
    cout <<"The estimated resale value for a non-hybrid after 5 years?" << endl;
    cin >> nonhybrid_resale;
if(nonhybrid_resale < 0)
    cout <<"Please enter a positive value." << endl;
} while(nonhybrid_resale < 0);
     
 
 string buying_crit;
    cout <<"Would you like results sorted by lowest gas consumption(\"gas\")\n or lowest total cost(\"total\")?" << endl;
    cout << "Enter 'gas' or 'total'\n"; 
    cin >> buying_crit;








//calculations for hybrid
total_gallons_hybrid = miles_per_year / hybrid_mpg;
fuel_five_years_hybrid = miles_per_year / hybrid_mpg * gallon_gas;
depreciation_hybrid = hybrid_cost - hybrid_resale;
total_cost_hybrid = fuel_five_years_hybrid + depreciation_hybrid;






cout <<"Your car is a "<< //some variable or something here <<endl;
cout <<"Total gallons of fuel used for 5 years: $ "<< total_gallons_hybrid << endl;
cout <<"Total cost of owning the car for 5 years: $ " << total_cost_hybrid << endl;


//calculations for NON-hybrid
total_gallons = miles_per_year / non_hybrid_mpg;
fuel_five_years = miles_per_year / non_hybrid_mpg * gallon_gas;
depreciation = cost_nonhybrid - nonhybrid_resale;
total_cost = fuel_five_years + depreciation;




cout <<"Your car is a "<< //some variable or something here <<endl;
cout <<"Total gallons of fuel used for 5 years: $ "<< total_gallons << endl;
cout <<"Total cost of owning the car for 5 years: $ " << total_cost << endl;








system("pause");
return 0;