File handling with Array filled with a class

>> Would appreciate any help.

I think it would be best to start a separate thread and post your code and the exact error message. These types of errors can have many different causes.

Persoanlly, I woudl just treat the class as if it were a struct. The member functions are only contextual, they dont actually occupy space in the object. You may want to use #pragma pack(1) to guarantee the smallest footprint

I declare it in my class and when I wnat to use the function as below I get the error message No match for operator[]. If I remove the line dayReport[i].dayOfMonth = dayP then it works but it is not read into the array.

Code:

istream& operator >> (istream& fin, weatherReport dayReport[])
{
    Do something
    dayReport[i].dayOfMonth = dayP;
}

I think you should be reading into a weatherReport & instead of into the array. That's just how it's done in C++. Move the code that loops through the array into a separate function and read into each weatherReport one at a time.