Is there any way to put a default argument? xc8

Question

I have this simple lcd xc8 header file:

#ifndef XC_PANTALLACWS_H
#define XC_PANTALLACWS_H

#include "lcd.h"

void pantallaCWS (const char stringProyecto){
    const char stringProyecto[16] = "__proyNombre____";
    Lcd_Init();
    Lcd_Out(1, 0, stringProyecto);
}

#endif

What I would like to do is that, if an argument is not given in the function, put one by default.

is this possible?

Answer 1

First, I think there is an error in your argument declaration as it is only one char but you want a string.

Then the trick is to check for a null argument, and if so, provide your default argument in the function, for example:

void pantallaCWS (const char *stringProyecto){
    const char *myString;
    if (stringProyecto==0)
        myString= "__proyNombre____";
    else
        myString= stringProyecto;
    Lcd_Init();
    Lcd_Out(1, 0, myString);
}