How Should I Modify My C++ Code to Start Time Calculation from Zero?

[physics=world]

#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

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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?

 

[chiro]

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.

 

[physics=world]

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.

Are you saying get rid of my input "t"?

 

[physics=world]

Are you saying get rid of my input "t"?

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! :)

 

[LudusRex]

It seems like you are trying to create a loop that starts from 0 and counts up to a certain value. To do this, you can replace the "for" loop in your code with a "while" loop. Here is an example of how you could modify your code to start from 0 and count up to 0.1:

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;

int main()
{
double t = 0; // initialize t to 0
cout << "Enter the total time: ";
double end_time;
cin >> end_time;

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

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

while (t <= end_time) { // loop until t reaches the end_time
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; // increment t by the step size
}
return 0;
}

I hope this helps! Please let me know if you have any further questions or need clarification.