Arrays

[kirillpushkin]

Hi,

I am a C++ learner , therefore, please do not judge me very much for not handling such a simple problem. I am trying to write a code (playing), which converts Fahrenheits into Celcius, and prints out both results on the screen. Like

F[0] = "", C=[0] = ""

and like that. But I cannot figure out how to make the program remember, print out the Fahreneheits as well. All I can successfully do is to print out only Celcius, using an array.

C[0] = " "

Can you please tell me how to handle this problem? Do I need to make, apparently I need, a multidimensional array?? My code is appended below.

Thanks!

// arrays as parameters
#include <iostream>
using namespace std;

const int MAX = 5;

int main ()
{

int array[MAX][MAX];
int i;
int j;

for (i=0; i < MAX; i++)

for (j=0; j < 1; j++)
{

int C, F;

cout << "Enter temperature in Fahrenheits:";
cin >> F;

C = (F - 32) * 5/9;
array[i][j] = C,F;

}

for (i = 0; i <= 4; i++)
for (j = 0; j <= 4; j++)

cout << "C[" << i << " " << j << "] = " << array[i][j] << endl; //Print out data into the screen

return 0;
}

[S6k9GNh0]

I'm confused. You don't need arrays at all, none the less a multi-dimensional array.

Example:

#include <iostream>
#include <sstream>

double ctof(double degree)
{
   return  degree * 9/5 + 32;
}

int main(int argc, char ** argv)
{
   if (argc < 2)
      std::cout << "Usage: ctof <number>" << std::endl;
   else
   {
        std::stringstream ss ( argv[1] );  
        double result = 0;
        ss >> result;   
        std::cout << ctof(result) << std::endl;
   }
   return 0;
}

[cnoeval]

@ computerquip: I think he's trying to generate a table of converted values.

@ OP: No offense but you've bitten off more than you can chew. Start with the basics.

http://cplusplus.com/doc/tutorial/

[kirillpushkin]

That is right. I am trying to make a table of converted values. I can do it only for one type of values. Here is an example for conversion of Fahrenheit to Celsius, but I do not see the Fahrenheit values, only Celsius.

// Program converts temperature from Fahrenheits into Celcius
// and writes the values into a file
//Created 05/05/2010
//by Kirill Pushkin

#include <fstream>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace std;

const int MAX = 10;

int main ()

{
int temperature[MAX]; // array
int i;

for (i = 0; i < MAX; i++)

{
int celcius, fahrenheit;

cout << "Enter temperature in fahrenheits:\n>";
cin >> fahrenheit;

celcius = (fahrenheit - 32) * 5/9; // conversion of temperature from Fahrenheits into Celcius
temperature[i] = celcius;

}

ofstream myfile; // command to open a file for writing with a name whatever you like
myfile.open ("/home/kirillpushkin/Documents/rootanalysis/C++_progs/examples/temperature.txt"); //creation of a file in a particular directory

for (i = 0; i <= 9; i++)
// Print temperature on the screen

// cout << "temperature[" << i << "] = " << temperature[i] << endl; //Print out data into the screen

myfile << "temperature[" << i << "] = " << temperature[i] << endl; //Writes data directly into a file

myfile.close(); // close the file

return 0;
}

The output:
ubuntu:~/Documents/rootanalysis/C++_progs/examples> cat temperature.txt
temperature[0] = 32
temperature[1] = 26
temperature[2] = 21
temperature[3] = 15
temperature[4] = 10
temperature[5] = 4
temperature[6] = -1
temperature[7] = -6
temperature[8] = -12
temperature[9] = -17

[kirillpushkin]

So I made two arrays, but the output of this code is all messed up. Can anybody tell me where I screwed up?
Thanks!

// arrays as parameters
#include <iostream>
using namespace std;

const int MAX = 5;

int main ()
{
int carray[MAX];
int farray[MAX];
int i,j;
int C, F;

for (i=0; i < MAX; i++)

for (j=0; j < MAX; j++)

{

cout << "Enter temperature in Fahrenheits: \n";
cin >> F;
farray[i] = F;

C = (F - 32) * 5/9;
carray[j] = C;

}

for (i = 0; i <= MAX; i++)


for (j = 0; j <= MAX; j++)

cout << "Fahrenheit[" << i << "] = " << farray[i]<< " " "Celsius[" << j << "] = " << carray[j] << endl; //Print out data into the screen

return 0;
}

Fahrenheit[0] = 5 Celsius[0] = -6
Fahrenheit[0] = 5 Celsius[1] = -5
Fahrenheit[0] = 5 Celsius[2] = -5
Fahrenheit[0] = 5 Celsius[3] = -4
Fahrenheit[0] = 5 Celsius[4] = -3
Fahrenheit[0] = 5 Celsius[5] = 10536
Fahrenheit[1] = 10 Celsius[0] = -6
Fahrenheit[1] = 10 Celsius[1] = -5
Fahrenheit[1] = 10 Celsius[2] = -5
Fahrenheit[1] = 10 Celsius[3] = -4
Fahrenheit[1] = 10 Celsius[4] = -3
Fahrenheit[1] = 10 Celsius[5] = 10536
Fahrenheit[2] = 15 Celsius[0] = -6
Fahrenheit[2] = 15 Celsius[1] = -5
Fahrenheit[2] = 15 Celsius[2] = -5
Fahrenheit[2] = 15 Celsius[3] = -4
Fahrenheit[2] = 15 Celsius[4] = -3
Fahrenheit[2] = 15 Celsius[5] = 10536
Fahrenheit[3] = 20 Celsius[0] = -6
Fahrenheit[3] = 20 Celsius[1] = -5
Fahrenheit[3] = 20 Celsius[2] = -5
Fahrenheit[3] = 20 Celsius[3] = -4
Fahrenheit[3] = 20 Celsius[4] = -3
Fahrenheit[3] = 20 Celsius[5] = 10536
Fahrenheit[4] = 25 Celsius[0] = -6
Fahrenheit[4] = 25 Celsius[1] = -5
Fahrenheit[4] = 25 Celsius[2] = -5
Fahrenheit[4] = 25 Celsius[3] = -4
Fahrenheit[4] = 25 Celsius[4] = -3
Fahrenheit[4] = 25 Celsius[5] = 10536
Fahrenheit[5] = 17 Celsius[0] = -6
Fahrenheit[5] = 17 Celsius[1] = -5
Fahrenheit[5] = 17 Celsius[2] = -5
Fahrenheit[5] = 17 Celsius[3] = -4
Fahrenheit[5] = 17 Celsius[4] = -3
Fahrenheit[5] = 17 Celsius[5] = 10536
(int)0

[cnoeval]

OK, we avoid providing complete code here but I'm going to do it since you need some perspective. Besides, I don't believe this is homework and you're putting in a lot of effort. Kudos for that! You're starting to get the idea but you are WAY over-complicating things.

Look at how simple this app can be (and I added the ability to specify a starting and ending temperature, plus a step so you don't have to see every temperature between them):

#include <iostream>
using namespace std;

int main()
{
	int start, end, step;

	cout << "Enter Start Temp: "; cin >> start;
	cout << "Enter End Temp: "; cin >> end;
	cout << "Enter Temp Step: "; cin >> step;

	for(int f=start; f<=end; f+=step)
	{
		cout << f << "F = " << (f-32)*5/9 << "C" << endl;
	}

	return 0;
}

Look Ma! No arrays!

I suggest you try some of the more simple coding problems and get comfy with the basics. That way when you get to the tough stuff you'll have a solid foundation and things won't be so confusing. There are plenty of good beginner problems around here, just do a search.

[cnoeval]

Almost forgot: Please use code tags when you post. Select the code part(s) in your posts and click the <> Format: button on the right. It makes it SO much easier to read other peoples code and that makes it much more likely that you will get somebody to help you.

[kirillpushkin]

Thank you, Cnoeval. I really appreciate your HELP!

[kirillpushkin]

Cnoeval, wow, it is a simple as only possible!