mikroC

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Function Definition

mikroC - C Compiler for Microchip PIC microcontrollers

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 function 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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MikroElektronika: Development tools - Books - Compilers

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