Getting array values from separate text file - c++

Question

This is my first attempt at getting a bunch of values from a separate text document. I have a separate text file named P.txt with the following values 13 49
16 2
4 0
90 60
40 20
60 -100
7 1
5 9
3 3
15 -22
11 7
12 3
I have never tried to get data from an outside file to put into an array and while working I keep getting errors on line 15 which is:
read_data(int nums[], int size);
Visual studio says that it is expecting a ")" after int and that the read_data function does not take 0 arguments. Can anyone explain these errors to me and help guide me in the right direction? Thanks!
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
void read_data(int nums[], int size);
int main()
{
const int size = 24;
ifstream dataIn;
double lab[size];
cout << "The numbers on file are:\n ";
read_data(int nums[], int size);
system("PAUSE");
return 0;
}
void read_data(int nums[], int size)
{
ifstream dataIn;
dataIn.open("P.txt");
if( dataIn.fail() )
{
cout << "File does not exist." << endl;
exit(1);
}
int count;
for ( count = 0; count < size; count++ )
{
dataIn >> nums[count];
}
dataIn.close(); }

Answer 1

The problem is in the line read_data(int nums[],int size);
You cannot declare a variable in a function call.
Also, you cannot use system("pause") without stdlib.h or cstdlib
Use this instead :
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstdlib>
using namespace std;
void read_data(int nums[], int size);
int main()
{
const int size = 24;
ifstream dataIn;
double lab[size];
int nums[size];
cout << "The numbers on file are:\n ";
read_data(nums, size);
system("PAUSE");
return 0;
}
void read_data(int nums[], int size)
{
ifstream dataIn;
dataIn.open("P.txt");
if( dataIn.fail() )
{
cout << "File does not exist." << endl;
exit(1);
}
int count;
for ( count = 0; count < size; count++ )
{
dataIn >> nums[count];
}
dataIn.close(); }