Hello there, I am new to using classes, and have been having so many problems. I don't want to go to my teacher if I don't have to, because it is always my luck that it is something easy that I just overlooked somehow. I have been working on this for 3 days and I can't get it to read from a file.
#include <iostream>
#include "cMonthlyRainfall.h"
cMonthlyRainfall::cMonthlyRainfall()
{
}
void cMonthlyRainfall::set_values (cMonthlyRainfall &month, ifstream &fin)
{
int i;
for (i = 0; i < 12; i++)
{
fin >> month[i].rainfall;
fin >> month[i].hi_temp;
fin >> month[i].lo_temp;
month[i].average_temp = (month[i].hi_temp + month[i].lo_temp) / 2;
} //End for loop
} //End function set_values()
The errors that I am receiving are attached to that cpp file and the error codes are:
Code:
C:\Users\KingAroan\Desktop\CodeBlocks\Rainfall\cMonthlyRainfall.cpp||In member function 'void cMonthlyRainfall::set_values(cMonthlyRainfall&, std::ifstream&)':|
C:\Users\KingAroan\Desktop\CodeBlocks\Rainfall\cMonthlyRainfall.cpp|23|error: no match for 'operator[]' in 'month[i]'|
C:\Users\KingAroan\Desktop\CodeBlocks\Rainfall\cMonthlyRainfall.cpp|24|error: no match for 'operator[]' in 'month[i]'|
C:\Users\KingAroan\Desktop\CodeBlocks\Rainfall\cMonthlyRainfall.cpp|25|error: no match for 'operator[]' in 'month[i]'|
C:\Users\KingAroan\Desktop\CodeBlocks\Rainfall\cMonthlyRainfall.cpp|27|error: no match for 'operator[]' in 'month[i]'|
C:\Users\KingAroan\Desktop\CodeBlocks\Rainfall\cMonthlyRainfall.cpp|27|error: no match for 'operator[]' in 'month[i]'|
C:\Users\KingAroan\Desktop\CodeBlocks\Rainfall\cMonthlyRainfall.cpp|27|error: no match for 'operator[]' in 'month[i]'|
||=== Build finished: 6 errors, 0 warnings ===|
And finally here is my main.cpp file:
Code:
#include <iostream>
#include <fstream>
#include <iomanip>
#include "cMonthlyRainfall.h"
using namespace std;
int main()
{
ifstream fin;
int count;
cMonthlyRainfall month[12]; //Creates an object for each month
fin.open ("weather.dat");
if (!fin)
{
cout << "ERROR: Unable to find weather.dat";
return 1;
}
cMonthlyRainfall::set_values(month, fin)
return 0;
}
I am sure the errors are connected to the array but I am not sure since I haven't worked with a class before. I have been googling and reading the book but I can't figure it out. Thanks for any help.
The error has nothing to do with it being a class or not...
You are passing it as a reference(&), which implies a single object. You should be passing it as a pointer(*) which implies one or more objects in a row -- i.e. a pointer to an object, or a pointer to several objects. You don't need to take the address of the array itself -- the array itself already is an address, which the [] operator converts into a direct access..
---------- Post updated at 04:38 PM ---------- Previous update was at 04:15 PM ----------
Why have you declared all your members as pointers, by the way? You'll have to allocate them or make them point to something before you can use them -- being pointers, they are useless until you give them something to point to. If you just want them to hold one value per object, remove the * and just let them be floats.
Last edited by Corona688; 02-05-2012 at 06:36 PM..
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