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Mar 22nd, 2009

Re: End of file function + Array

OK, Here we go.

The input file is:

2 40
3 80
6 50
1 15
2 70

And here's the result (WTH?):

=> The Attachment

And the codes:

C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <iomanip>
#include <fstream>
 
using namespace std;
 
 
 
int main()
 
{
 
ifstream infile("TEMPER.dat");
ofstream outfile("RESULT.dat");
 
int i=0;
double x = 0.549;
double P[1000], V[1000], T[1000]; 
 
cout<<"Case\t"<<"P(atm)\t"<<"V(l)\t"<<"T(K)"<<endl 
    <<"----\t"<<"------\t"<<"-----\t"<<"----"<<endl;
outfile<<"Case\t"<<"P(atm)\t"<<"V(l)\t"<<"T(K)"<<endl 
       <<"----\t"<<"------\t"<<"-----\t"<<"----"<<endl;
 
for (i=0; infile>>P[i]>>V[i]; i++)
{ 
	infile>>P[i]>>V[i];
 
	T[i]=((P[i]*V[i])/x);
 
 
	cout<<i+1<<"\t"<<P[i]<<"\t"<<V[i]<<"\t"<<T[i]<<"\t"<<endl;
 
	outfile<<i+1<<"\t"<<P[i]<<"\t"<<V[i]<<"\t"<<T[i]<<"\t"<<endl;
 
}
return 0;
}
#include <iostream>
#include <iomanip>
#include <fstream>

using namespace std;



int main()

{

ifstream infile("TEMPER.dat");
ofstream outfile("RESULT.dat");

int i=0;
double x = 0.549;
double P[1000], V[1000], T[1000]; 

cout<<"Case\t"<<"P(atm)\t"<<"V(l)\t"<<"T(K)"<<endl 
    <<"----\t"<<"------\t"<<"-----\t"<<"----"<<endl;
outfile<<"Case\t"<<"P(atm)\t"<<"V(l)\t"<<"T(K)"<<endl 
       <<"----\t"<<"------\t"<<"-----\t"<<"----"<<endl;

for (i=0; infile>>P[i]>>V[i]; i++)
{ 
	infile>>P[i]>>V[i];

	T[i]=((P[i]*V[i])/x);


	cout<<i+1<<"\t"<<P[i]<<"\t"<<V[i]<<"\t"<<T[i]<<"\t"<<endl;

	outfile<<i+1<<"\t"<<P[i]<<"\t"<<V[i]<<"\t"<<T[i]<<"\t"<<endl;
 
}
return 0;
}

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Size: 6.5 KB
ID: 9543

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Mar 22nd, 2009

Re: End of file function + Array

C++ Syntax (Toggle Plain Text)
 double P[1000], V[1000], T[1000];
 double P[1000], V[1000], T[1000];

Next time try to use a STL vector for this . you can make a struct that contains int P , int V and int T and make a vector of that struct. And Feel free to use the STL libraries , they are implemented on many plactforms.

and you better using x like this

C++ Syntax (Toggle Plain Text)
const double x = 0.549;
const double x = 0.549;

Last edited by NicAx64; Mar 22nd, 2009 at 5:59 am.

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Mar 22nd, 2009

Re: End of file function + Array

Click to Expand / Collapse Quote originally posted by NicAx64 ...

C++ Syntax (Toggle Plain Text)
 double P[1000], V[1000], T[1000];
double P[1000], V[1000], T[1000];
Next time try to use a STL vector for this . you can make a struct that contains int P , int V and int T and make a vector of that struct. And Feel free to use the STL libraries , they are implemented on many plactforms.

and you better using x like this
C++ Syntax (Toggle Plain Text)
const double x = 0.549;
const double x = 0.549;

Using "const double" doesn't make any difference in this case.
And as I said already, our tutor is a bit strict. For this assignment, we can't use STL library, dynmaic memory or ...

Any suggestion about the output? why is it only 3 and why random?

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Mar 22nd, 2009

Re: End of file function + Array

From the code you posted in #11 above:

line 27: delete that line because it is causing the program to read twice. The data was already read on line 25 in the for loop.

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Mar 23rd, 2009

Re: End of file function + Array

Great! Works like a charm. Thanks AncientDragon.

Now let's look at this one which is almost the same, but I'm getting only the first line.

C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <fstream>
 
using namespace std;
 
int main()
 
{
 
ifstream infile("Data.dat");
 
int t[1000], v[1000], x[1000];
int i=0;
 
for (i=0; infile>>t[i]>>v[i]; i++)
{ 
	x[i]=v[i]*t[i];
 
cout<<"The Displacement for t= "<<t[i]<<" and v= "<<v[i]<<" is: "<<x[i]<<endl<<endl;
 
}
return 0;
}
#include <iostream>
#include <fstream>

using namespace std;

int main()

{

ifstream infile("Data.dat");

int t[1000], v[1000], x[1000];
int i=0;

for (i=0; infile>>t[i]>>v[i]; i++)
{ 
	x[i]=v[i]*t[i];

cout<<"The Displacement for t= "<<t[i]<<" and v= "<<v[i]<<" is: "<<x[i]<<endl<<endl;
 
}
return 0;
}

This is Data.dat:

0 0
0.2 0.1
0.4 0.3
0.6 0.6
0.8 0.9
1.0 1.4
1.2 1.9
1.4 2.6
1.6 3.5
1.8 4.5
2.0 5.7
2.2 7.0
2.4 8.5
2.6 9.9
2.8 11.5
3.0 12.8
3.2 14.2
3.4 16.4
3.6 18.4
3.8 20.1
4.0 19.5
4.2 18.7
4.4 16.6
4.6 15.5
4.8 14.1
5.0 12.9
5.2 11.5
5.4 9.6
5.6 8.0
5.8 6.4
6.0 5.2
6.2 3.9
6.4 3.2
6.6 2.6
6.8 2.1
7.0 1.7
7.2 1.2
7.4 0.9
7.6 0.5
7.8 0.1

And the result:

=> The attachment

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Mar 23rd, 2009

Re: End of file function + Array

make the arrays float instead of int. ifstream is producing an error attempting to convert that decimal point to an int.

Last edited by Ancient Dragon; Mar 23rd, 2009 at 8:52 am.

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Mar 23rd, 2009

Re: End of file function + Array

Another thread solved by Ancient Dragon.
I wish you were our lecturer/ tutor.

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Mar 23rd, 2009

Re: End of file function + Array

>>I wish you were our ... tutor

I am.

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