ABL electronic PIC Microcontrollers PIC16 - Manual (Page 105)

Function Definition
Function definition consists of its declaration and a function body. The function
body is technically a block – a sequence of local definitions and statements
enclosed within braces
{}
. All variables declared within function body are local to
the function, i.e. they have function scope.
The function itself can be defined only within the file scope. This means that func-
tion declarations cannot be nested.
To return the function result, use the
return
statement. Statement
return
in
functions of
void
type cannot have a parameter – in fact, you can omit the
return
statement altogether if it is the last statement in the function body.
Here is a sample function definition:
/* function max returns greater one of its 2 arguments: */
int max(int x, int y) {
return (x>=y) ? x : y;
}
Here is a sample function which depends on side effects rather than return value:
/* function converts Descartes coordinates (x,y)
to polar coordinates (r,fi): */
#include <math.h>
void polar(double x, double y, double *r, double *fi) {
*r = sqrt(x * x + y * y);
*fi = (x == 0 && y == 0) ? 0 : atan2(y, x);
return ; /* this line can be omitted */
}
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