Page 105 - Programming Microcontrollers in C

90 Chapter 2 Advanced C Topics

hold.y=y;
return hold;
}
Observe that the struct point is treated as a type with no diffi­
culty in this function. The return type is struct point, and within
the body of the function hold is also a type struct point. The x
argument passed to the function is placed in the x member of hold as
is the y argument placed in the y member. Then the struct hold is
returned to the calling function. All of these operations are legal.
Since structures create types, structures can have members that
are structures. For example, suppose that the struct rect for a
rectangle is defined as
struct rect
{
struct point p1;
struct point p2;
};

Let’s outline a program that will inscribe a circle within a rect­
angle. The circle is tangent to the sides that make up the narrowest
dimension of the rectangle.

/* Inscribe a circle in a rectangle */
/* first declare some useful structures */

struct point
{
int x;
int y;
};

struct circle
{
struct point center;
int radius;
};

struct rect
{