Ohm's Law Program with data sets

[conlan]

Hi all I am new to c++ as I am taking a entry level class. We have to write a program using ohm's law. The program uses arrays (possibly pointers) and has to use a data file that is given to us. The data file includes values for current and resistance. i know the math behind this program, but I am completely lost on how to get started and how to use a data file. Any help would be much appreciated. I know you don't want to do my homework I just can't find any examples online.

[conlan]

The command line should read
./voltage test.dat

[TarikNeaj]

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

https://www.youtube.com/playlist?list=PLAE85DE8440AA6B83 Video 64-68

https://www.youtube.com/playlist?list=PL2DD6A625AD033D36 Video 47-48

And you'll also get tons of more information if you google or youtube it.

[conlan]

Thanks I watched 64-68 and it helped in getting me started I will post my code in a couple of hours or when I run into trouble.

[TarikNeaj]

Sounds great :) Please use code tags when you post your code - http://www.cplusplus.com/articles/jEywvCM9/

[conlan]

This is my code so far I know it is not much, but I cannot seem to figure out how to limit the user to inputting ten values for current and 10 for resistance. I also cant figure out how to get the code to run the inputted values. Anyways here is what I have:


#include <iostream>
#include <fstream>

using namespace std;

int main() {

ofstream myfile("test.dat");
cout << "Enter current and resistance." << endl;
cout << "Press ctrl+z after inputting 10 values for current and resistance \n" << endl;
double current;
double resistance;
double voltage;
while( cin>> current >> resistance) {
myfile << current <<' '<< resistance << endl;
}


ifstream file ("test.dat");


while( file >> current >> resistance) {
voltage = current * resistance;
cout << voltage << "\t" << current << "\t" << resistance<< endl;
}
}

[conlan]

This is my code so far I know it is not much, but I cannot seem to figure out how to limit the user to inputting ten values for current and 10 for resistance. I also cant figure out how to get the code to run the inputted values. Anyways here is what I have:


#include <iostream>
#include <fstream>

using namespace std;

int main() {

ofstream myfile("test.dat");
cout << "Enter current and resistance." << endl;
cout << "Press ctrl+z after inputting 10 values for current and resistance \n" << endl;
double current;
double resistance;
double voltage;
while( cin>> current >> resistance) {
myfile << current <<' '<< resistance << endl;
}


ifstream file ("test.dat");


while( file >> current >> resistance) {
voltage = current * resistance;
cout << voltage << "\t" << current << "\t" << resistance<< endl;
}
}

[conlan]

Here is what I have so far. I cannot seem to figure out how to limit the user input to 10 values for current and resistance and I don't know how to get this data to run in the rest of the program.

#include <iostream>
#include <fstream>

using namespace std;

int main() {

ofstream myfile("test.dat");
cout << "Enter current and resistance." << endl;
cout << "Press ctrl+z after inputting 10 values for current and resistance \n" << endl;
double current;
double resistance;
double voltage;
while( cin>> current >> resistance) {
myfile << current <<' '<< resistance << endl;
}


ifstream file ("test.dat");


while( file >> current >> resistance) {
voltage = current * resistance;
cout << voltage << "\t" << current << "\t" << resistance<< endl;
}
}