Download Here:

http://dl.dropbox.com/u/52078/Development/C/lotto/lotto.c

——

I’ve been going though K&R C Programming Language lately & brushing up on my programming skills. All the while talking to a buddy of mine that programs frequently. He gave me a challenge to give him some lotto numbers for standard lotto & pick5. The final version is a pseudo random variation, but I don’t know enough programming know how yet to get it to be absolute, or even close to true random. Anywho about 30 minutes later I had a simple alteration whipped up like the following:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define NUMBERS 6 /* How many numbers do you want? */
#define MAX 46 /* Max random value */

int main (void) {
 int num;

 /* get 6 random numbers */
 srand ( time (NULL) ); /* make a random number based on unix time */

 printf ("Your lotto numbers are: n");
for ( num = 0; num < NUMBERS; num++ ) { /* repeat for how many numbers you want */
 if ( ( random = rand () % MAX ) == 0 ) /* prevents 0 from being outputted */
 printf ( "t%d", rand () % MAX );
  else
   printf ( "t%d", random );
 }

 printf ("n");
 return 0;
}

It will output something like the following:

Your lotto numbers are:
23    33    4    35    14    1

This will output 6 random numbers. The actual randomness is happening based on srand && it makes it random based on unix time. http://linux.die.net/man/3/srand has a nice little description of srand & rand, or if you’re at a terminal you can type ‘man srand’ and get some info.

After I finished this, low and behold he wanted pick5 too. (which is 5 sets of 6 numbers), well I added this & made a little prompt for ease of use. The following program is the complete solution. You can view it below or download it from my public dropbox link ^^ look at the top ^^:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define NUMBERS 6 /* How many numbers do you want? */
#define MAX 46 /* Max random value */

int main (void) {
 int num, pick5, type, random;

 printf ( "Hey Chris, what would you like to do today?nn>> Type number you wish to execute:n" );
 printf ( "(1) Standard Lotton" );
 printf ( "(2) Pick5 Lotton" );

 scanf ( "%d", &type );

 switch ( type ) {
 case 1: /* get 6 random numbers */
 srand ( time (NULL) ); /* make a random number based on unix time */

 printf ("Your lotto numbers are: n");

 for ( num = 0; num < NUMBERS; num++ ) { /* repeat for how many numbers you want */
 if ( ( random = rand () % MAX ) == 0 )
 printf ( "t%d", rand () % MAX );
 else
 printf ( "t%d", random );
 }
 printf ("n");
 break;

 case 2: /* get 5 sets of 6 random numbers */
 srand ( time (NULL) ); /* make a random number based on unix time */

 printf ("Here's five sets of lotto pics for ya: n");

 for ( pick5 = 0; pick5 < 5; pick5++ ) {
 printf ("Set %d:n", pick5);
 for ( num = 0; num < NUMBERS; num++ ) {
 if ( ( random = rand () % MAX ) == 0 )
 printf ( "t%d", rand () %MAX );
 else
 printf ( "t%d", random );
 }
 printf ("n");
 }
 break;

 default:
 printf ("You messed up stupid. Try againn");
 }

 return 0;
}

This will output something like the following:

[jgerold@jgerold-mbp13.smsi.com ~/Dropbox/Public/Development/C/lotto]$ ./lotto
Hey Chris, what would you like to do today?

>> Type number you wish to execute:
(1) Standard Lotto
(2) Pick5 Lotto
1
Your lotto numbers are:
23    33    4    35    14    1
[jgerold@jgerold-mbp13.smsi.com ~/Dropbox/Public/Development/C/lotto]$ ./lotto
Hey Chris, what would you like to do today?

>> Type number you wish to execute:
(1) Standard Lotto
(2) Pick5 Lotto
2
Here's five sets of lotto pics for ya:
Set 0:
 14    40    1    1    28    36
Set 1:
 15    45    17    11    44    45
Set 2:
 6    2    37    43    19    25
Set 3:
 37    4    31    16    11    9
Set 4:
 38    37    25    17    1    44