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storing buffer in int array
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HomerSexual
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PostPosted: Tue Oct 23, 2007 4:38 pm    Post subject: storing buffer in int array Reply with quote

say i have a 4 char buffer, how can i put each char into a an array of int. Also how can i access each of these numbers.

so say i want char 3 of int array, so could i just access it using int[2];

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Noz3001
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PostPosted: Tue Oct 23, 2007 4:41 pm    Post subject: Reply with quote

Thats like trying to input the letter Q into a calculator..
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nox
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PostPosted: Tue Oct 23, 2007 4:58 pm    Post subject: Reply with quote

it needs to be multi-dimensional
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DeltaFlyer
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PostPosted: Tue Oct 23, 2007 5:01 pm    Post subject: Reply with quote

Code:

int i;
char buffer [4];
int array [4];
//populate the char buffer
for (i = 0; i < 4 ; i++){
  array[i] = (int)buffer[i];
}


That?

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HomerSexual
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PostPosted: Tue Oct 23, 2007 6:35 pm    Post subject: Reply with quote

oh i forgot to mention im gonna try to get the value of each number. like
a =1
b = 2
z = 26

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DeltaFlyer
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PostPosted: Tue Oct 23, 2007 6:57 pm    Post subject: Reply with quote

Code:

int i;
char buffer [4];
int array [4];
//populate the char buffer
for (i = 0; i < 4 ; i++){
  array[i] = (int)(buffer[i]|0x20)-'a'+1;
}

That?

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HomerSexual
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PostPosted: Tue Oct 23, 2007 7:56 pm    Post subject: Reply with quote

Code:
case WM_HOTKEY:
           if(wParam == 1)
            {
          hEdit = FindWindowEx(hwnd, NULL, "Edit", NULL);
          GetWindowText(hEdit, &t, 2);
          MessageBox(hwnd, &t, " ", MB_OK);
          if( &t == "a")
          {


          i = value(&t);
          MessageBox(0, itoa(i, temp, 10), "Error", MB_OK);
          }
            }
            break;

Code:
int value(char* let)
{
    if(let == "a")
     return 1;

    if(let == "b")
     return 2;
    if(let == "c")
     return 3;
    if(let == "d")
     return 4;
    if(let == "e")
     return 5;
    if(let == "f")
     return 6;
    if(let == "g")
     return 7;
    if(let == "h")
     return 8;
    if(let == "i")
     return 9;
    if(let == "j")
     return 10;
    if(let == "k")
     return 11;
    if(let == "l")
     return 12;
    if(let == "m")
     return 13;
    if(let == "n")
     return 14;
    if(let == "o")
     return 15;
    if(let == "p")
     return 16;
    if(let == "q")
     return 17;
    if(let == "r")
     return 18;
    if(let == "s")
     return 19;
    if(let == "t")
     return 20;
    if(let == "u")
     return 21;
    if(let == "v")
     return 22;
    if(let == "w")
     return 23;
    if(let == "x")
     return 24;
    if(let == "y")
     return 25;
    if(let == "z")
     return 26;

     else
     MessageBox(0, "Shit", "Error", MB_OK);
}


thats my functions. Its checking a char t for a and run the value but for some reason if i put a in and a is in the MB with 2 bytes, it doesn't run the code. Does anyone know why a isn't coming up as a?

sorry im confusing, im tired :[

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appalsap
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PostPosted: Tue Oct 23, 2007 8:06 pm    Post subject: Reply with quote

you can't use == to compare character arrays, you need to use strcmp or strncmp
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DeltaFlyer
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PostPosted: Tue Oct 23, 2007 8:24 pm    Post subject: Reply with quote

blankrider wrote:

Code:
int value(char* let)
{
    if(let == "a")
     return 1;

    if(let == "b")
     return 2;
    if(let == "c")
     return 3;
    if(let == "d")
     return 4;
    if(let == "e")
     return 5;
    if(let == "f")
     return 6;
    if(let == "g")
     return 7;
    if(let == "h")
     return 8;
    if(let == "i")
     return 9;
    if(let == "j")
     return 10;
    if(let == "k")
     return 11;
    if(let == "l")
     return 12;
    if(let == "m")
     return 13;
    if(let == "n")
     return 14;
    if(let == "o")
     return 15;
    if(let == "p")
     return 16;
    if(let == "q")
     return 17;
    if(let == "r")
     return 18;
    if(let == "s")
     return 19;
    if(let == "t")
     return 20;
    if(let == "u")
     return 21;
    if(let == "v")
     return 22;
    if(let == "w")
     return 23;
    if(let == "x")
     return 24;
    if(let == "y")
     return 25;
    if(let == "z")
     return 26;

     else
     MessageBox(0, "Shit", "Error", MB_OK);
}

Did you completely ignore what I posted? Hint: single quotes around a character represents its ASCII value. You can get an integer value with small 'a' as 1 by subtracting the ASCII value by 'a' then add one.

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atom0s
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PostPosted: Tue Oct 23, 2007 8:41 pm    Post subject: Reply with quote

You could also compare like this:

Code:
int GetLetterValue(const char* szLetter)
{
   char szAlphabet[27]= {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
   for( int x=0; x<sizeof(szAlphabet); x++ )
      if( (int)szAlphabet[x] == (int)szLetter[0] )
         return x+1;
   return -1;
}


Comparing the letters numeric value.

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DeltaFlyer
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PostPosted: Tue Oct 23, 2007 8:53 pm    Post subject: Reply with quote

but would this not be much simpler?
Code:

int GetLetterValue(const char* szLetter)
{
   if (szLetter[0] >= 'a' && szLetter[0] <= 'z')
      return (int)(szLetter[0]-'a'+1);
   return -1;
}

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nog_lorp
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PostPosted: Wed Oct 24, 2007 2:19 pm    Post subject: Reply with quote

Ooh, ooh, let me make a suggestion thats way less efficient than Delta Flyer's solution too!

Quote:
single quotes around a character represents its ASCII value

Lie! Single quotes = const char. So you should cast it to int or you'll get *gasp* compiler warnings!

Also, you have to offset it differently for lowercase VS capitals, or do toLower() on them all, because there are some symbols and stuff inbetween the two sets in the ASCII definition.

Anyhow, in the end this is quite silly.
Code:
char chararray[4];
int intarray[4];
intarray = (int*)chararray;


Voila. Although the values in intarray are still the ascii codes rather than in the 1-26 range. But then, why not deal with that when you use them instead? Don't convert all the data and restore it, instead make a macro and convert when you use the values.

Code:
#define TOALPHOFFSET(x) (int)(x-(int)'a'-1)
printf("%d",TOALPHOFFSET(intarray[2]));

~nog_lorp

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HomerSexual
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PostPosted: Wed Oct 24, 2007 3:41 pm    Post subject: Reply with quote

Code:
        case WM_HOTKEY:
           if(wParam == 1)
            {
          hEdit = FindWindowEx(hwnd, NULL, "Edit", NULL);
          GetWindowText(hEdit, t, sizeof(t));
          r = 0;
          i = 0;
        while(isalpha(t[i]))
         i++;
        while(r <= i-1)
        {

            arr[r] = GetLetterValue(&t[r]);
            itoa(arr[r], temp, 10);
            MessageBox(0, temp, "Error", MB_OK);
            r++;


            }
            int staMatrix[2][2] =
            {
                arr[0], arr[1],
                arr[2], arr[3],
            };
            finMatrix[2][2] = encMatrix[2][2] * staMatrix[2][2];
          // itoa(finMatrix[2][2], buffer[2][2], 10);
          // MessageBox(0, (char*)buffer[2][2], "Error", MB_OK);


            }
            break;


well i did that and i figured it out and stored the first FOUR digits in a matrix, staMatrix. Im multiplying this by a matrix. It multiplies fine but i can't convert the value to char to display it in a textbox. Any ideas, this is my first encounter with matrices outside of pencil and paper

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nog_lorp
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PostPosted: Wed Oct 24, 2007 4:15 pm    Post subject: Reply with quote

Stop thinking about matrices and start thinking about fundamentals. Matrices aren't your problem.

To convert from the alphabetical offset back to characters, do the opposite of GetLetterValue, (char)(num - (int)'a').

Another thing: matrices aren't a type in C. FFS, those are multidimensional arrays, not matrices, you cant just multiply 2 of them and expect C to do matrix multiplication. You are multiplying two array elements.

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HomerSexual
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PostPosted: Wed Oct 24, 2007 4:24 pm    Post subject: Reply with quote

well i found a code and i made a new type called Matrix
and theres a function called matrixMultiply. And nog, i wasn't there yet...I am just about the make the GetLetterVal function as we speak. I have it so that it works right now.

And Matrices are my problem because i wasn't converting back yet and the problem was in matrix mult.

oh yeah nog you were wrong

char GetNumberValue(int in)
{
return (char)(in + (int)'a' - 1);
}

>.>

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