constant structure array

dezz101 · 10-28-2009, 07:20 PM

I've got a constant structure array that represents a song, i declare another const struct of the same type and make this constant structure array = the other one, what is the correct code

Code:

//**************************
typedef struct 
{
  int note;
  int beats;
}Note_Beats;
//**************************



//***********************************************
//***************Song list***********************
//***********************************************

//********When The Saints Go Marching In*********
#define NumberOfBeats_Saints 16
const Note_Beats Saints[NumberOfBeats_Saints] = { {C6, 1}, {E6, 1}, {F6, 1}, {G6, 5},      {C6, 1}, {E6, 1}, {F6, 1}, {G6, 5},       {C6, 1}, {E6, 1}, {F6, 1}, {G6, 2}, {E6, 2}, {C6, 2}, {E6, 2}, {D6, 5} };
//***********************************************  
  
//**************Choose Song Here*****************
#define NumberOfBeats  NumberOfBeats_Saints
const Note_Beats Song = Saints;
//***********************************************

I am getting the error where I decalare "Song" and make it = "Saints"
ie at this code:

Code:

const Note_Beats Song = Saints;

help please!

dezz101 · 10-28-2009, 07:38 PM

can you not make an array equal to another array or something??? sooo consfused :

hk_mp5kpdw · 10-28-2009, 08:01 PM

Code:

const Note_Beats Song = Saints;

When Song is pushed onto the stack, it's set to be const. Then you try and assign something to it but it's already const and you can't change something that's const. You could do it just like you did for the first const struct... or in C++ you could create a constructor for the struct and do the following:

Code:

const Note_Beats Song(Saints);

but I'm afraid your options are limited in C. Would a memcpy of the contents work perhaps (copying from one const struct to another)?

quzah · 10-28-2009, 08:09 PM

Why don't you just make a list of songs, and wander through it with a pointer?

Quzah.

dezz101 · 10-28-2009, 08:29 PM

Quote:

Originally Posted by hk_mp5kpdw

Code:

const Note_Beats Song = Saints;

When Song is pushed onto the stack, it's set to be const. Then you try and assign something to it but it's already const and you can't change something that's const. You could do it just like you did for the first const struct... or in C++ you could create a constructor for the struct and do the following:

Code:

const Note_Beats Song(Saints);

but I'm afraid your options are limited in C. Would a memcpy of the contents work perhaps (copying from one const struct to another)?

Im not trying to change the value of the const, im declaring it and setting it to be equal to the const Saints struct

and what is this code going to do??

Code:

const Note_Beats Song(Saints);

doesnt make any sense to do this???

Elysia · 10-29-2009, 01:17 AM

You are trying to assign an array to a single element. How can you fit several rooms inside one room?
The line of code you are confused about is C++ syntax. If you do not use C++, you can ignore it.

Epy · 10-29-2009, 05:30 AM

Code:

{ {C6, 1}, {E6, 1}, {F6, 1}, {G6, 5},      {C6, 1}, {E6, 1}, {F6, 1}, {G6, 5},       {C6, 1}, {E6, 1}, {F6, 1}, {G6, 2}, {E6, 2}, {C6, 2}, {E6, 2}, {D6, 5} }

It lets you assign C6 etc for the int note part? Should have a 0x in front of that if it's supposed to be hex.

10-28-2009, 07:38 PM	#2
dezz101 Registered User Join Date: Mar 2008 Posts: 47	can you not make an array equal to another array or something??? sooo consfused :
dezz101 is offline

10-28-2009, 08:01 PM	#3
hk_mp5kpdw Registered User Join Date: Jan 2002 Location: Northern Virginia/Washington DC Metropolitan Area Posts: 2,870	Code: const Note_Beats Song = Saints; When Song is pushed onto the stack, it's set to be const. Then you try and assign something to it but it's already const and you can't change something that's const. You could do it just like you did for the first const struct... or in C++ you could create a constructor for the struct and do the following: Code: const Note_Beats Song(Saints); but I'm afraid your options are limited in C. Would a memcpy of the contents work perhaps (copying from one const struct to another)? __________________ On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question. --Charles Babbage, 1792-1871 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
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10-28-2009, 08:09 PM	#4
quzah +++ OK NO CARRIER Join Date: Oct 2001 Posts: 10,642	Why don't you just make a list of songs, and wander through it with a pointer? Quzah. __________________ Hundreds of thousands of dipshits can't be wrong. Are you up for the suck?
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10-29-2009, 05:30 AM	#7
Epy I like turtles Join Date: Sep 2009 Location: Ohio Posts: 322	Code: { {C6, 1}, {E6, 1}, {F6, 1}, {G6, 5}, {C6, 1}, {E6, 1}, {F6, 1}, {G6, 5}, {C6, 1}, {E6, 1}, {F6, 1}, {G6, 2}, {E6, 2}, {C6, 2}, {E6, 2}, {D6, 5} } It lets you assign C6 etc for the int note part? Should have a 0x in front of that if it's supposed to be hex. __________________ -Jake http://thatcadguy.blogspot.com/
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