Notes 10 27 2014

Passing Arrays to Functions
1. When I want to pass an array to a function, I just use the name 
of the array.
2. The function declaration indicates that a parameter is an array
by including [] in the name of the array.
For Example
printArray( myOutputFile, myArray, size );

Passing an Array Element to a Functions
1. Use the [] and an index value in the function call.
For Example
double angles[10];
for ( int i=0;i<10; i++ )
	cout << sin( angles[i] );
	

Structs or Structure Data

A struct is a way to bundle data together

struct Data
{
	int x;
	double y;
	void setX( int newx );//we can do this
}; //<----notice they end with a ;

Data myData; //this makes a variable of type Data

myData.x = 10;//dot notation
myData.y = 12.4;

//this is a member function to setx
void Data::setX( int newx )
{
	x = newx;
}

Arrays of Structs

Data myArrayOfData[10];

for ( int i=0; i<10; i++ )
{
	myArrayOfData[i].x = i;
	myArrayOfData[i].y = i*1.0;
	//---or ---- these next 4 lines do exactly what the previous 2 do
	Data myData = myArrayOfData[i];//get myData out of the array
	myData.x = i;
	myData.y = i*1.0;
	myArrayOfData[i] = myData; //stuff myData back in the array
}