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I need some help with my c++ code

  1. Jan 23, 2015 #1
    #include <iostream>
    #include <iomanip>
    #include <cmath>
    using namespace std;



    int main()
    {
    cout << "Enter the total time: ";
    double t;
    cin >> t;

    cout << "Enter the step-size: ";
    double step;
    cin >> step;

    double steps = ceil(t/step);

    const double a = 9.806; // accel. due to gravity // m/(sec^2)

    for (int count = 0; count <= steps; count++) {


    double v = (a*t); // calculation for velocity

    const double half = 0.5;
    double x = (half)*(a)*(pow(t, 2)); // calculation for distance

    cout << "t: " << setprecision(4) << fixed << t << "\tx: " << x << "\tv: " << v << endl;

    t -= step;
    }

    return 0;


    This is the result i'm getting:

    Enter the total time: 0.1
    Enter the step-size: 0.01
    t: 0.1000 x: 0.0490 v: 0.9806
    t: 0.0900 x: 0.0397 v: 0.8825
    t: 0.0800 x: 0.0314 v: 0.7845
    t: 0.0700 x: 0.0240 v: 0.6864
    t: 0.0600 x: 0.0177 v: 0.5884
    t: 0.0500 x: 0.0123 v: 0.4903
    t: 0.0400 x: 0.0078 v: 0.3922
    t: 0.0300 x: 0.0044 v: 0.2942
    t: 0.0200 x: 0.0020 v: 0.1961
    t: 0.0100 x: 0.0005 v: 0.0981
    t: 0.0000 x: 0.0000 v: 0.0000

    ___________________________________

    What I am trying to do is to begin from zero and work my way down to 0.1000.
    I still need to enter 0.1 for the total time (which is variable "t" in the code).

    How would I code it in order to make it begin from zero?
     
  2. jcsd
  3. Jan 23, 2015 #2

    chiro

    User Avatar
    Science Advisor

    Hey physics=world.

    You are setting your t as what you input. Instead what you should do is use another variable (say tstep), set it equal to zero and then instead of using t -= step you use tstep += step.

    Take a look at your code again to see what's happening.
     
  4. Jan 23, 2015 #3
    Are you saying get rid of my input "t"?
     
  5. Jan 23, 2015 #4
    I see what your talking about. The "t" in both equation is not suppose to be the value taken from the user.
    Thanks for helping me! :)
     
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