Random Array map

[peacealida]

hi everybody

i have a map here 32 X 32, 1 = food , 0 = no food
I have postioned the food on the map like follow:

char matrix[MATRIX_SIZE][MATRIX_SIZE];
char matrix_data[MATRIX_SIZE][MATRIX_SIZE] =
  { {0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0},
    {0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0},
    {0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0},
    {0,0,0,1,1,1,1,0,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,1,1,1,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0},
    {0,0,0,1,1,0,0,1,1,1,1,1,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,1,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
  };

char trace_matrix[MATRIX_SIZE][MATRIX_SIZE];


void output_program(struct prog *progp)
{
  char *codep = progp->code;
  char token;

  while (token = *codep++)
     fputs(token_table[token].name, stdout);
  putchar('\n');
}


void print_matrix(void)
{  int i, j; char symbs[] = " OX";

   for (i=0; i < MATRIX_SIZE; i++)
   {  for (j=0; j < MATRIX_SIZE; j++)
          putchar(symbs[trace_matrix[i][j]]);
      putchar('\n');
   }
}

Now i am looking to create a random array, so everytime it runs food place into different place.


100 food i am needed and 32 X 32 grid map.


Thanks for evey1's help

[tabstop]

I think every post from the last thread is still applicable: why should trace_matrix and matrix_data be related; and to generate random food, generate a row and a column using rand until you hit a square with no food. (To get a number between 0 and 31, you can use rand()%32.)

[peacealida]

Becasue this program is going to show by XML trace_matrix will be use later on the XML Tree

Really thaks for you quick response. I am really not trying to ask some1 to code for me.

But any1 know any similar example i can learn ??
thanks

[peacealida]

Hi I think I need to change my mind now, coz if i randomly add food
than the XML structre will be completely difference??

original working code attached

cherrys every1

[tabstop]

Hi I think I need to change my mind now, coz if i randomly add food
than the XML structre will be completely difference??

I'm pretty sure nothing could be further from the truth. All the XML structure is, is formalizing your data. The data hasn't changed -- it's still 1 for food and 0 for not, in cells, in a grid.

[peacealida]

Thanks god.
I will play around it tonight. see how far it goes.
I will follow up in the morninging
thanks tabstop

[peacealida]

tabstop how much time you have spent to be a programmer???

I think you must working hard hard

[tabstop]

tabstop how much time you have spent to be a programmer???

I think you must working hard hard

What makes you think I'm a programmer?

[peacealida]

If you are not programmer or some kind of computer related job, how can you reply the anser so quick??

Don't tell me you are 10 years old boy just doing it for fun please
I will kill myself

[sy84n]

About the rand()%30 function, Is there an option to random between specific numbers that I select? like for example: between 100 to 300 only. meaning sparing 0-99.

[iMalc]

About the rand()%30 function, Is there an option to random between specific numbers that I select? like for example: between 100 to 300 only. meaning sparing 0-99.

You're supposed to start your own thread to ask for help. But I can see you're new here so I'll cut you some slack this first time. Make sure you read the FAQ etc before next post anyway.
The answer is simple, adding 100 to your random number will make sure it is greater than 99.

[sy84n]

OK. first - thank you
I wrote it this way: number = 100 + rand()%300 + 1;
It did not work well, the random stays the same every time I run it.

also tried: number = rand()%300 + 100;
didn't work also. ( I use Dev-C++ Compiler, maybe it is related?)

I'll read the FAQ.

[dwks]

It did not work well, the random stays the same every time I run it.

I'm sure there's something in the FAQ about this, but here it is anyway: you have to call srand() to initialize the random number generator. Usually one initializes it with the current time. Not only that, but you can only call this function once.

If you don't seed the random number generator, you will indeed get the same numbers every time.

Think for a moment about what this does.

number = 100 + rand() % 300;

It calls rand(). It uses modulus to restrict this number to the range [0,300). Then it adds 100 to the number. In effect, you have a number in the range [100,400). (From 100 to 400, including 100 but not 400. Or from 100 to 399, inclusive.)

Perhaps you don't know what modulus does. It returns the remainder of a division. So n % 3 means "divide n by three and return what was left over" -- using integer division, of course. In effect, this means that by modulus-ing by 3, you'll get either 0, 1, or 2. Think about it.

All of this means that the formula you want is probably

n = 100 + rand() % 200;

for 100 to 199 (inclusive), or

n = 100 + rand() % 201;

for 100 to 200, or

n = 101 + rand() % 200;

for 101 to 200 (again, inclusive).

Food for thought.

#include <stdio.h>
#include <stdlib.h>  /* for srand() and rand() */
#include <time.h>  /* for time() */

int main() {
    int x;

    /* Seed the random number generator. */
    srand((unsigned)time(0));

    /* Generate and print ten random numbers. */
    for(x = 0; x < 100; x ++) {
        int n = 100 + rand() % 200;
        printf("%d\n", n);
    }
}

[peacealida]

So I have to creata 300 random numbers bewteen 1-1024?
But how do I assigned value "1" into the array field??

[peacealida]

Is this make any sense?
what i want is to fill 300 1s into the array field
thanks for the help XX

char matrix[MATRIX_SIZE][MATRIX_SIZE];
char matrix_data[MATRIX_SIZE][MATRIX_SIZE] = {{0}};
int main()  {
    int x;
    srand(time(0));

    for(x=0; x<[MATRIX_SIZE]; x++) {
        int n = 100 + rand() &#37; 300;
        printf("%d\n", 1);
    
    for (x = 0; x < 300; x++) matrix_data[rand()%MATRIX_SIZE][rand()%MATRIX_SIZE] = 1;
        
    }
}