Question

I had help with a program, it requires constants and 3 functions.

1. Ask the user for the number of miles on the route, the average speed and the time of day
2. Randomly generate an increase in the route time based upon whether it’s rush hour or not
3. Calculate the minutes in the route based upon miles, average speed and random traffic increase
4. Print out the miles, minutes and a message

The program will continue asking the user for another trip’s miles, speed, and time until the user decides to quit.

Use the table below to determine the random chance of traffic

	Rush Hour (and hour of 7, 8, 17 or 18)	Not Rush Hour
No traffic	5%	50%
Small traffic	10%	30%
Medium traffic	35%	15%
Large traffic	50%	5%

Use the table below to determine the time added depending upon the amount of traffic

Traffic Type	Time Added
No traffic	0
Small traffic	25%
Medium traffic	50%
Large traffic	100%

I must write and use the following functions:

• int getUserData( double& miles, double& avgSpeed, int& hours): This function gets the miles, average speed and hour of the day from the user. It prints and error message for invalid data (see sample execution below). It returns 0 if the user decided to end the program, a -1 if the user entered invalid data or a 1 if the user entered valid data. Its post-condition is that the reference parameters contain the valid miles, average speed and hour that the user entered.
• double calcTrafficIncrease( int hour ): This function randomly determines an amount of traffic based upon the hour and returns it. The function returns either 1 for no traffic, 1.25 for a small amount of traffic, 1.5 for a medium amount of traffic or 2.0 for a large amount of traffic (see table above).
• void printOutput( double miles, double minutes, double trafficIncrease ): this function prints the miles, minutes and message (depending upon the amount of traffic). Output messages indicating traffic are:

No traffic.

A slight amount of traffic.

There is a lot of traffic. You are still on the fastest route.

Major traffic. You are not on the fastest route.

I must use the following main function, make any constants.

int main() {    double miles, avgSpeed; // avgSpeed per hour    double timeToSchool;    // in minutes    double trafficIncrease; // increase in time due to traffic,                            // ie. MEDUIM_TRAFFIC_ADDED    int rv;                 // return value of getUserData    int hour;               // starting hour in 24-hour clock srand( time( 0 ) );    cout.precision( 0 );    cout.setf( ios::fixed );    cout << "Welcome to Poogle Maps\n";    rv = getUserData( miles, avgSpeed, hour );    while ( rv != END ) {       if ( rv != INVALID_DATA ) {          trafficIncrease = calcTrafficIncrease( hour );          timeToSchool = miles / avgSpeed * 60 * trafficIncrease;          printOutput( miles, timeToSchool, trafficIncrease );       } // end if valid data       rv = getUserData( miles, avgSpeed, hour );    }    cout << "Exiting Poogle Maps\n"; }

Answer 1

C++ code:

#include<iostream>
#include<stdlib.h>
using namespace std;

#define END 0
#define INVALID_DATA -1

//function to take input from user
int getUserData( double& miles, double& avgSpeed, int& hours)
{
   cout<<"\nEnter distance (in miles) (0 to exit):";
   cin>>miles;
   if(miles==0)
       return(0);
   cout<<"Enter average speed (in miles/hour):";
   cin>>avgSpeed;
   cout<<"Enter time(24 hours format):";
   cin>>hours;
   if(hours>0 and hours<25)
   {
       return(1);
   }
   cout<<"\nInvalid data........\n";
   return(-1);
}

//function to calculate traffic randomly from given time
double calcTrafficIncrease(int hour)
{
   int n=rand()%100+1;//generate a random number between 1 and 100
   if(hour==7 || hour==8 ||hour==17 ||hour==18)
   {
       //in rush hpur
       //1-5(No traffic) 6-15(Small traffic) 16-50(Medium traffic) 51-100(Large Traffic)
       if(n<=5) //if n is [1,5] then No traffic as it's percentage is 5%
       {
           return(1);
       }
       else if(n>5 && n<=15) //for small traffic
       {
           return(1.25);
       }
       else if(n>15 && n<=50)   //for medium traffic
       {
           return(1.5);
       }
       else               //for large traffic
       {
           return(2);
       }
   }
   else
   {   //in No rush hour
       //1-50(No traffic) 51=80(Small traffic) 81-95(Medium traffic) 96-100(Large Traffic)
       if(n<=50) //if n is [1,50] then No traffic as it's percentage is 50%
       {
           return(1);
       }
       else if(n>51 && n<=80) //for small traffic
       {
           return(1.25);
       }
       else if(n>81 && n<=95)   //for medium traffic
       {
           return(1.5);
       }
       else                   //for large traffic
       {
           return(2);
       }
   }
  
}

//function to print output
void printOutput(double miles, double minutes, double trafficIncrease)
{
   cout<<"\nDistance covered: "<<miles<<" miles"<<endl;
   cout<<"Time : "<<minutes<<" minutes"<<endl;
   cout<<"Traffic increase: "<<trafficIncrease<<endl;
}

//main function
int main()
{
   double miles, avgSpeed; // avgSpeed per hour
double timeToSchool; // in minutes
double trafficIncrease; // increase in time due to traffic,
// ie. MEDUIM_TRAFFIC_ADDED
int rv; // return value of getUserData
int hour; // starting hour in 24-hour clock

//srand( time( 0 ) );
cout.precision( 0 );
cout.setf( ios::fixed );
cout << "Welcome to Poogle Maps\n";
rv = getUserData( miles, avgSpeed, hour );
while ( rv != END ) {
if ( rv != INVALID_DATA ) {
trafficIncrease = calcTrafficIncrease( hour );
timeToSchool = miles / avgSpeed * 60 * trafficIncrease;
printOutput( miles, timeToSchool, trafficIncrease );
} // end if valid data
rv = getUserData( miles, avgSpeed, hour );
}
cout << "Exiting Poogle Maps\n";
}

Output: