Hints to compile as wanted

[doc17]

Im suppose to create a program in which i ask user for MPH and time traveled.
Hour Distance Traveled
1 80
2 160
3 240

      double vs; // vehicle speed 
      double hours; 
      double S_H;
    
      cout << " Enter the speed of the vehicle (MPH): " << endl;
      cin >> vs;

      cout << "Enter the period of time the vehicle has traveled (hours): " << endl;
      cin >> hours;

      S_H = hours * vs;
      
       int i; 
       for (i = vs; i < S_H; i++)
         {
               cout << "Hours   Distance Travalled" << endl;
              cout << i << " " <<endl;
         }

code is compiling incorrectly and i thinks its because of the i++ any help to compile accurately.

[MiiNiPaa]

loop should be:

cout << "Hours   Distance Travalled" << endl;
for (i = 1; i <= hours; ++i) {
    cout << i << "\t" << i * vs << endl;
}

[unsensible]

The problem isn't with i++ it's with your loop conditions. You're loop is going to run 120 times if the user inputs 40 and 3 because it's taking the product of these two as the for condition for how long the loop should run.

change i<S_H to i<hours and change i=vs to i=1. Then the loop should run the correct number of times. But that's not the only problem. Then the program would only display

1
2
3

With no additional values. So how do we get the others to show? Well the first one is easy. just add the following statement in your loop:

cout << "Hours   Distance Travalled" << endl;
              cout << i << " " <<vs<<endl;

so now we have
1 40
2 40
3 40

how do we update the value with each loop iteration? We use += on vs (MPH). But we need a temporary variable to hold the initial value so we don't lose it.

Example:

double temp;
temp = vs;

So, change your loop to look like the following:

 for (i = 1; i < hours; i++)
         {
               cout << "Hours   Distance Travalled" << endl;
               cout << i << " " << vs<<endl;
               vs += temp; //adds 40 (or whatever the user enters) with each iteration 
         }

You'll also realize after this that S_H is a variable that will not be needed in this program.

[doc17]

So you made the for loop for the time instead of the distance and just made the calculation after. Thank you, makes so much sense now.

[doc17]

thank you unsensible & MiiNiPaa. and thank you for the well detailed explanation i need that so i don't make this mistake again.