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Using Array of string

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esa
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Using Array of string

Posted: Mon Jan 07, 2008 4:08 pm

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Dear Users,
I need help about using array of String. (for PIC18F4550+CCS V4.057)
In my program, I initialize two arrays :

Code:

char LCDstring [10][10]={"OFF","ON","CH.","t=","Alm.","CODE","XXXX","Alarm1=","Alarm2=","mV"};
char LCDstring2 [3][20]={"Input-Output type ","Calculation type ","Precision "};

Then, I use this array in a fct to print on a LCD :

Code:

lcd(LCDstring2[0],1,0,_CURSEURDROIT);
lcd(echelle,1,20,_CURSEURDROIT);
lcd(LCDstring2[1],2,0,_CURSEURDROIT);
lcd(courbe,2,20,_CURSEURDROIT);

When I use the first array, it's working, but the second array, I don't have a good result ( on LCD, I see other variable)

Where is the problem ?
The solve my problem, I make this :

Code:

strcpy(strmenutemp,"Input-Output type ");lcd(strmenutemp,1,0,_CURSEURDROIT);
strcpy(strmenutemp,"Calculation type ");lcd(strmenutemp,2,0,_CURSEURDROIT);
strcpy(strmenutemp,"Precision ");lcd(strmenutemp,3,0,_CURSEURDROIT);

But, I prefer to understand my mistake.

More questions :
What is the difference between :

Code:

const char unites[] [*]={"ppb ","ppm ","mgr/l","ugr/l","% "};
const char* pan_ids[] = {"aaaa", "bbbb", "cccc", "dddd", "eeee"};
char const *pan_ids[] = {"aaaa", "bbbb", "cccc", "dddd", "eeee"};
const char unitess[5][6]= { {"ppb "},{"ppm "},{"mgr/l"},{"ugr/l"},{"% "}};

In this case, I need to use strcpy, to place this string in a array.
I try to use a pointer directly on this array ( with PIC18). IT,s working in a program test ( little code), But, when I use the same code in my big program, I have wrong result.

This is my code : (working in a program test, but not in my big program )

Code:

compteurunit=0;
*unite=unites[compteurunit];
printf("\n\r unite=unites[compteurunit] unité %s",unite);
compteurunit++;
*unite=unitess[compteurunit];
printf("\n\r unite=unitess[compteurunit] unité %s",unite);
compteurunit++;
strcpy(unite2,unites[compteurunit]);
printf("\n\rstrcpy(unite2,unites[compteurunit]) unité2 %s",unite2);
compteurunit++;
strcpy(unite2,unitess[compteurunit]);
printf("\n\rstrcpy(unite2,unitess[compteurunit]) unité2 %s",unite2);

Regards

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Jan 07, 2008 4:39 pm

Reply with quote

The test program shown below can read the strings from the array.
It displays this output:

Quote:

Input-Output type
Calculation type
Precision

Code:

#include <18F4550.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

char const LCDstring2 [3][20]={"Input-Output type ","Calculation type ","Precision "};

//====================================
void main()
{
int8 i;
for(i = 0; i < 3; i++)
puts(LCDstring2[i]);

while(1);
}

meereck

Joined: 09 Nov 2006
Posts: 173


Posted: Tue Jan 08, 2008 2:05 pm

this might be useful: http://www.ccsinfo.com/content.php?page=flexconst http://www.ccsinfo.com/content.php?page=varconst

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