please review my first project

I have gotten the program to compile and display the words, but I cannot put the inputs in to finish the program. What is wrong with it? Thanks.

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

int main()

int c,v,lo,l;

c = 299792458

cout << "This program will solve the lorentz and FitzGerald contraction formula. " << endl;
cout << "The formula states that L = length times the square root of one minus velocity squared divided by the. " << endl;
cout << "speed of light squared. " << endl;
cout << "Enter the length. " << endl;
cin >> lo;
cout << "Enter the velocity. " << endl;
cin >> v;
l = lo * sqrt(1.0 -(pow(v, 2.0) / pow(2.0)));
cout << "The contraction is" << endl;
cout << l << endl;

return 0;
Are you getting error messages or is the answer just not accurate?

1.) There needs to be a ; after giving c a value. (error message)

2.) If the problem is about accuracy I suggest declaring your ints as doubles instead so that they can deal in decimal points.
double c,v,lo,l;

3.) You need the speed of light into your actual calculations. (Thank you Wikipedia).
l = lo * sqrt(1.0 -(pow(v, 2.0) / pow(c, 2.0)));

I haven't actually run your program through my compiler, so there may be more issues, but that's what I've got so far.
Interesting program for a first project, looking forward to seeing more.
Last edited on
I have gotten the program to work now, but I need to have it round to four decimal points and when i type that in, I don't get an output. What might be causing that?
Repost your working code and we'll take a look, otherwise include <iomanip> and take a look at the example function for setprecision on this link;
Topic archived. No new replies allowed.