Question

Polpak/Amistre/Imran/Joemath/Myininaya/Estudier/any other programming/math guru, can you take a look at my source code and see if everything is right?

Answer 1

Everything is working fine, but my conversion are different from the professors..

Answer 2

#include<iostream>
#include<cmath>
#include<iomanip>

using namespace std;

int main()
{
double w, m, a_yrs, a_days_on_Earth;
cout << "Please enter your weight (lbs):\n";
cin >> w;
m=w/9.81;
cout <<"\n";
cout << "Please enter your age (years):\n";
cin >> a_yrs;
a_days_on_Earth=a_yrs*365;

double g_Me=3.59,
g_Ve=8.87,
g_Mo=1.62,
g_Ma=3.77,
g_Ju=25.95,
g_Sa=11.08,
g_Ur=10.67,
g_Ne=14.07;

double y_Me=88,
y_Ve=224.7,
y_Mo=365,
y_Ma=686.961,
y_Ju=4331.572,
y_Sa=10832.327,
y_Ur=30799.095,
y_Ne=60190;

double w_Me=m*g_Me,
w_Ve=m*g_Ve,
w_Mo=m*g_Mo,
w_Ma=m*g_Ma,
w_Ju=m*g_Ju,
w_Sa=m*g_Sa,
w_Ur=m*g_Ur,
w_Ne=m*g_Ne;

double a_Me=a_days_on_Earth/y_Me,
a_Ve=a_days_on_Earth/y_Ve,
a_Mo=a_days_on_Earth/y_Mo,
a_Ma=a_days_on_Earth/y_Ma,
a_Ju=a_days_on_Earth/y_Ju,
a_Sa=a_days_on_Earth/y_Sa,
a_Ur=a_days_on_Earth/y_Ur,
a_Ne=a_days_on_Earth/y_Ne;

cout <<"\n";
cout << left << setw(11)
<<"Planet Weight"
<< right << setw(11) << "Age\n"
<<"------ ------ ---\n";
cout <<"Mercury "<<w_Me<<" lbs";
cout <<" "<<a_Me<<" yrs"<<"\n";
cout <<"Venus "<<w_Ve<<" lbs";
cout <<" "<<a_Ve<<" yrs"<<"\n";
cout <<"Moon "<<w_Mo<<" lbs";
cout <<" "<<a_Mo<<" yrs"<<"\n";
cout <<"Mars "<<w_Ma<<" lbs";
cout <<" "<<a_Ma<<" yrs"<<"\n";
cout <<"Jupiter "<<w_Ju<<" lbs";
cout <<" "<<a_Ju<<" yrs"<<"\n";
cout <<"Saturn "<<w_Sa<<" lbs";
cout <<" "<<a_Sa<<" yrs"<<"\n";
cout <<"Uranus "<<w_Ur<<" lbs";
cout <<" "<<a_Ur<<" yrs"<<"\n";
cout <<"Neptune "<<w_Ne<<" lbs";
cout <<" "<<a_Ne<<" yrs"<<"\n";

system("pause");
return 0;
}

Answer 3

im not a guru, im only a Superhero =/

Answer 4

Doesn't matter joe, u're a guru for me, all yall haha

Answer 5

hmm that looks ugly.. I can attach .cpp and .exe files..

Answer 6

I didn't think you divided pounds by g to get mass? Mixing up units.

Answer 7

yea I did. Look at the variable declaration statement:
cout << "Please enter your weight (lbs):\n";
cin >> w;
m=w/9.81;
from then on I'm working with mass

Answer 8

But that's if you have Newtons.

Answer 9

Okay look weight is mass * gravity
So on earth:
M = weight/gravity
m=w/9.8
So I get the actual mass of the person.
Then I redo:
w_Ve=m*g_Ve
So that's the m*g on venus

Answer 10

I know that. I'm saying you are using pounds which is not an SI unit.

Answer 11

And using 9.81 which is in SI units.

Answer 12

Ohh THATS WHY IM SO OFFF!!! THanks!!!

Answer 13

How many pounds are in a kilogram?

Answer 14

Google it. ;)

Answer 15

lol too lazy, but I will.. ughh americans and englishmen.. why did they have to make our lives so complicated.

Answer 16

1 kilogram = 2.20462262 pounds

Answer 17

That's what we call a logical error in computer science. ;)

Answer 18

Yea I kno I just googled it haha

Answer 19

anyway hold up, let me fix the code..

Answer 20

oh snap now I have to convert it back to lbs.. HOLY MOLY!!!

Answer 21

LOL I was actually closer to the right answer when I didn't convert anything, was only off for two planets.

Answer 22

actually doing that was stupid, I am displaying the output in lbs not kgs. So I ended up converting it to kgs and back to lbs and still had the same numbers.

Answer 23

So it's still wrong?

Answer 24

Yea... take a look, I'm write for some numbers, wrong for some others. All the ages on diff planets are right, but the weights.. nope.. hold up ima attach a file

Answer 25

here take a look

Answer 26

meant *right not write haha

Answer 27

m = w/2.2 will give you kg

Answer 28

no mkuehn I already did that, I got it in kgs, then at the end i multiplied the result by 2.2 to get lbs.. and ended up getting the same thing

Answer 29

so the result was like multiplying by one

Answer 30

Where did you get your g values for the planets?

Answer 31

http://www.aerospaceweb.org/question/astronomy/q0227.shtml

Answer 32

Why don't you use the ratio of g / g-Earth instead?

You wouldn't have to do any conversions then, just multiply by that ratio to get the weight on the other planet.

Answer 33

"Since we now know the acceleration due to gravity on different worlds, we can easily determine how much an object weighs on those bodies. We have shown that the value of "g" on the Moon is 1/6th that of Earth, so an object on the Moon weighs only 1/6th as much as it would on Earth. A person weighing 150 pounds on Earth, for example, would weigh only 25 pounds on the Moon."

Answer 34

hold on, let me just check something, ill post a new thread.