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doguhanpala
Joined: 05 Oct 2016
Posts: 120
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| array size change after parameter sending (SOLVED) |
 Posted: Wed Mar 08, 2017 2:35 am |
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Hello everyone
I wrote a code play a melody. It works successfully. I want to use the 3 arrays (dizi, bosluk, notauzunluk) as parameter to notacal() function. The problem is, after sending the array to function its size changes and decreases to 2. I use 18f2550.
These are the codes.
This one is working good:
| Code: | #include <18F2550.h>
#DEVICE ADC=10
#fuses INTRC_IO,HS, NOWDT, NOLVP, HSPLL,NOMCLR,NOPROTECT,NODEBUG,NOBROWNOUT,USBDIV,PLL5,CPUDIV1,VREGEN,NOPUT
#use delay(clock=8000000)
#define voice PIN_A1
#include <math.h>
int16 A=568; //1
int16 Ad=536; //2
int16 B=506; //3
int16 C=955; //4
int16 Cd=901; //5
int16 D=851; //6
int16 Dd=804; //7
int16 E=758; //8
int16 F=715; //9
int16 Fd=675; //10
int16 G=634; //11
int16 Gd=602; //12
int16 A4=1136; //13
int16 Ad4=1072; //14
int16 B4=1012; //15
int16 C4=1911; //16
int16 Cd4=1803; //17
int16 D4=1702; //18
int16 Dd4=1607; //19
int16 E4=1516; //20
int16 F4=1431; //21
int16 Fd4=1351; //22
int16 G4=1275; //23
int16 Gd4=1203; //24
//!int8 dizi[]= {15,14,13,24}; //fail melody 15,14,13,24
//!int16 bosluk[]= {0,0,0,0}; //notalar arasındaki bekleme süresi
//!int16 notauzunluk[]= {500,500,500,2000}; //notaların çalınma süresi
//!
int8 dizi[]= {11,4,7,9,11,4,7,9,6,9,14,7,6,9,14,7,6,4}; //fail melody 15,14,13,24
int16 bosluk[]= {50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50}; //notalar arasındaki bekleme süresi
int16 notauzunluk[]= {2000,2000,200,200,1000,1000,200,200,4000,2000,2000,200,200,1000,1000,200,200,4000}; //notaların çalınma süresi
//!
int vurus=1;
int16 k;
int16 i;
int16 duration=0;
float nota=0;
float temp=0;
//notalar
void pausesong()
{
output_low(voice);
delay_us(vurus);
}
void playnote(long note)
{
output_high(voice);
delay_us(note);
output_low(voice);
delay_us(note);
}
void main(){
setup_oscillator(OSC_8MHz);
while(1){
delay_ms(1000);
for (k=0; k<=sizeof(dizi)-1; k++)
{
switch(dizi[k])
{
case 0: pausesong(); break;
case 1: nota=A; break;
case 2: nota=Ad; break;
case 3: nota=B; break;
case 4: nota=C; break;
case 5: nota=Cd; break;
case 6: nota=D; break;
case 7: nota=Dd; break;
case 8: nota=E; break;
case 9: nota=F; break;
case 10: nota=Fd; break;
case 11: nota=G; break;
case 12: nota=Gd; break;
case 13: nota=A4; break;
case 14: nota=Ad4; break;
case 15: nota=B4; break;
case 16: nota=C4; break;
case 17: nota=Cd4; break;
case 18: nota=D4; break;
case 19: nota=Dd4; break;
case 20: nota=E4; break;
case 21: nota=F4; break;
case 22: nota=Fd4; break;
case 23: nota=G4; break;
case 24: nota=Gd4; break;
}
temp=nota/1000;
duration=notauzunluk[k]/(temp*2);
for(i=0;i<(duration/2);i++)
{
playnote(nota);
}
delay_ms(bosluk[k]);
}
}
} |
So i wrote this code. I tried to send the arrays as parameters. I want to be able to choose a melody without commenting and uncommenting dizi, bosluk, notavurus arrays 
| Code: |
#include <18F2550.h>
#fuses INTRC_IO,NOWDT, PUT,NOMCLR,NOPROTECT,NOLVP,NODEBUG,NOBROWNOUT,CPUDIV1,VREGEN
#device ADC=10
#use delay(clock=8000000)
#use rs232(baud=9600,xmit=PIN_B7,rcv=PIN_B6)
#define voice PIN_A1
#include <math.h>
int16 A=568; //1
int16 Ad=536; //2
int16 B=506; //3
int16 C=955; //4
int16 Cd=901; //5
int16 D=851; //6
int16 Dd=804; //7
int16 E=758; //8
int16 F=715; //9
int16 Fd=675; //10
int16 G=634; //11
int16 Gd=602; //12
int16 A4=1136; //13
int16 Ad4=1072; //14
int16 B4=1012; //15
int16 C4=1911; //16
int16 Cd4=1803; //17
int16 D4=1702; //18
int16 Dd4=1607; //19
int16 E4=1516; //20
int16 F4=1431; //21
int16 Fd4=1351; //22
int16 G4=1275; //23
int16 Gd4=1203; //24
int8 dizi1[]= {15,14,13,24}; //fail melody 15,14,13,24
int16 bosluk1[]= {0,0,0,0}; //notalar arasındaki bekleme süresi
int16 notauzunluk1[]= {500,500,500,2000}; //notaların çalınma süresi
int8 dizi2[] = {24,21,3,12}; //başarı müziği
int16 bosluk2[]= {0,0,0,0}; //notalar arasındaki bekleme süresi
int16 notauzunluk2[]= {300,600,400,300}; //notaların çalınma süresi
int vurus=1;
int16 k;
int16 i;
int16 duration=0;
float nota=0;
float temp=0;
void pausesong();
void playnote(long);
void notacal(int8 dizi[],int16 bosluk[],int16 notauzunluk[]);
void main()
{
SETUP_OSCILLATOR(OSC_8MHZ);
while(TRUE)
{
notacal(dizi2,bosluk2,notauzunluk2); //size of dizi2 is 4
}
}
void pausesong()
{
output_low(voice);
delay_us(vurus);
}
void playnote(long note)
{
output_high(voice);
delay_us(note);
output_low(voice);
delay_us(note);
}
void notacal(int dizi[], int16 bosluk[], int16 notauzunluk[])
{
for (k=0; k<=sizeof(dizi)-1; k++)
{
printf("dizi = %d ",sizeof(dizi)); // i print the size of array and it is 2
switch(dizi[k])
{
case 0: pausesong(); break;
case 1: nota=A; break;
case 2: nota=Ad; break;
case 3: nota=B; break;
case 4: nota=C; break;
case 5: nota=Cd; break;
case 6: nota=D; break;
case 7: nota=Dd; break;
case 8: nota=E; break;
case 9: nota=F; break;
case 10: nota=Fd; break;
case 11: nota=G; break;
case 12: nota=Gd; break;
case 13: nota=A4; break;
case 14: nota=Ad4; break;
case 15: nota=B4; break;
case 16: nota=C4; break;
case 17: nota=Cd4; break;
case 18: nota=D4; break;
case 19: nota=Dd4; break;
case 20: nota=E4; break;
case 21: nota=F4; break;
case 22: nota=Fd4; break;
case 23: nota=G4; break;
case 24: nota=Gd4; break;
}
temp=nota/1000;
duration=notauzunluk[k]/(temp*2);
for(i=0;i<(duration/2);i++)
{
playnote(nota);
}
delay_ms(bosluk[k]);
}
}
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The size of dizi2 is 4 but after sending it to the notacal function it becomes 2.
I thought i am making a mistake at sending the array to function but it says here i am doing it right.
https://www.tutorialspoint.com/cprogramming/c_passing_arrays_to_functions.html
What am i missing?
Thank you so much.
Best wishes
Doguhan
Last edited by doguhanpala on Wed Mar 08, 2017 2:57 am; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19360
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| Posted: Wed Mar 08, 2017 2:44 am |
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size....
An array passed to a function _does not have a size_. What is passed is a 'pointer', which no longer 'knows' the size of the array. Sizeof this pointer, returns the size of the pointer, _not_ the array. Note in the code you point to, how they pass the 'size' of the array to the function as well.
You need to do the same. So:
| Code: |
notacal(dizi2,sizeof(dizi2), bosluk2,notauzunluk2); //size of dizi2 is 4
//then in the function:
void notacal(int dizi[],int16 size, int16 bosluk[],int16 notauzunluk[])
{
for (k=0; k<=size-1; k++)
{
printf("dizi = %d ",size);
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doguhanpala
Joined: 05 Oct 2016
Posts: 120
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| Posted: Wed Mar 08, 2017 2:56 am |
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| Ttelmah wrote: | size....
An array passed to a function _does not have a size_. What is passed is a 'pointer', which no longer 'knows' the size of the array. Sizeof this pointer, returns the size of the pointer, _not_ the array. Note in the code you point to, how they pass the 'size' of the array to the function as well.
You need to do the same. So:
| Code: |
notacal(dizi2,sizeof(dizi2), bosluk2,notauzunluk2); //size of dizi2 is 4
//then in the function:
void notacal(int dizi[],int16 size, int16 bosluk[],int16 notauzunluk[])
{
for (k=0; k<=size-1; k++)
{
printf("dizi = %d ",size);
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Thank you so much Ttelmah! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19360
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| Posted: Wed Mar 08, 2017 3:05 am |
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Thanks.
It's a 'get your head round' difference in C. Many languages now have an 'array' as a type, and when an array is passed, what is passed, includes the 'size' information. C doesn't do this, so problems like yours appear....
Well done, on writing code to try to see 'what was happening'. Adding the print to see what size was reported etc.. |
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