[SOLVED] Character array in C

[hemnath]

Hi all,

I have an array like this,

const unsigned char menu[2][6][8] = {
{"0 BAR ", "0.25 BAR", "0.5 BAR", "0.75 BAR", "1.0 BAR ", "EXIT "},
{"0 BAR ", "0.50 BAR", "1.0 BAR", "1.50 BAR", "2.0 BAR ", "EXIT "}
};

How can I call the particular array value to display.

I tried using

sprintf(temp_value, "%s", MENU[0][1]);

// in a compiler.
It doesn't works. Please help.

 

[thannara123]

Try it with.
sprintf(temp_value, "%s", &MENU[0][1])

 

[hemnath]

Thanks for the reply. But it doesn't works.

 

[Easyrider83]

It works:

#include <stdio.h>

int main()
{
    const unsigned char menu[2][6][8] = {
{"0 BAR ", "0.25 BAR", "0.5 BAR", "0.75 BAR", "1.0 BAR ", "EXIT "},
{"0 BAR ", "0.50 BAR", "1.0 BAR", "1.50 BAR", "2.0 BAR ", "EXIT "}
};
    printf("%s\n", menu[0][2]);

    return 0;
}

$gcc -o main *.c
$main
0.5 BAR

 

[KlausST]

Hi,

Thanks for the reply. But it doesn't works.

This is no error description and thus it does not help to encircle the problem.

--> please say
* how you test it (code)
* what you expect
* and what happens instead.

*****
Maybe it's a problem of the string delimiter. Often a 0x00 is used as string delimiter.
Try to insert it after each of your texts.

Klaus

 

[FvM]

Maybe it's a problem of the string delimiter. Often a 0x00 is used as string delimiter.
Try to insert it after each of your texts.

Almost hit the point. \0 delimiter is inserted automatically in char string constants, you don't need to write it explicitly. Problem of the code is however that it has no room for the delimiter, some strings are already 8 characters long, string length must increased to [9].

Depending on the unsaid processor and compiler, there may be an additional problem with ROM versus RAM strings.

 

[paulfjujo]

hello,

exemple of use with a display terminal
with MikroC

it doesn't works with sprintf, maybe because parameter is a Const char ( not in RAM)

const unsigned char Menu[2][6][9] =
{
{"0.00 BAR", "0.25 BAR", "0.50 BAR", "0.75 BAR", "1.00 BAR", "  EXIT  "}
,
{"0.00 BAR", "0.50 BAR", "1.00 BAR", "1.50 BAR", "2.00 BAR", "  EXIT  "}
};

Nota: same texte width in the menu !

// --- Copie le texte depuis FLASH ROM vers RAM
void strConstRamCpy(unsigned char *dest, const code char *source)
 {
  while (*source)*dest++ = *source++ ;
  *dest = 0 ;    // terminateur
}

void main()
{
 ....init Hardware & UART1

  UART1_Write_CText("Menu 1 :\r\n");
   for (i=0;i<6;i++)
   {
     strConstRamCpy(txt,Menu[0][i]) ; // --- Copie le texte depuis FLASH ROM vers RAM
     UART1_Write_Text(txt)   ;
    CRLF1();
   }
    CRLF1();
     UART1_Write_CText("Menu 2 :\r\n");
   for (i=0;i<6;i++)
   {
     strConstRamCpy(txt,Menu[1][i]) ;
     UART1_Write_Text(txt)   ;
    CRLF1();
   }
   while(1);
   
 }

result on display

Menu 1 :
0.00 BAR
0.25 BAR
0.50 BAR
0.75 BAR
1.00 BAR
EXIT

Menu 2 :
0.00 BAR
0.50 BAR
1.00 BAR
1.50 BAR
2.00 BAR
EXIT