# Help with a program...

• 02-27-2006
limitedmage
Help with a program...
Hi! I've been interested in programming for a while now, so a couple of months ago a bought a book so I could teach myself. The thing is, I'm having some trouble with an excercise. It's objective is to build a program that, using arrays, shows the results of throwing two dice 36.000 times. I have written up this code:

Code:

```// Ej. 6.19 // two dice throws #include <stdio.h> #include <stdlib.h> #include <time.h> #define N 13 // main starts program int main() {     int total; // total of two dice throws     int throws; // counter for number of throws     int frec[N]; // frequency of dice throws     int start; // user starts program with this         srand( time (NULL) ); // random number generator         printf( "\nProgram to simulate the throwing of 2 dice 36000 times\n" );             do     {         printf( "To start, type 1.\n" );         printf( "Otherwise, type any other number to exit.\n" );         scanf( "%d", &start );                 if( start != 1 )             break;                 // throws dice 36000 times         for( throws = 1; throws <= 36000; throws++ )         {             total = ( 1 + ( rand() % 6 ) ) + ( 1 + ( rand() % 6 ) );             frec[ total ]++;         } // end of for                 printf( "%s%17s\n", "Total", "Frequency" );                 for( total = 1; total < N; total++ )         {             printf( "%5d%17d\n", total, frec[total] );         } // end of for     } // end of do     while( start  == 1 );         return 0; // successfull end of program } // end of main```
But, the actual program running is really strane. The compiler (Dev-C++) didn't give any errors or warnings or anything.

Code:

```Program to simulate the throwing of 2 dice 36000 times To start, type 1. Otherwise, type any other number to exit. 1 Total        Frequency     1      2009284272     2          2294727     3      2009286276     4      2009148402     5          2297449     6      2009251663     7          2299872     8      2009289304     9      2009149352   10            2980   11      2009248549   12      2009306949 To start, type 1. Otherwise, type any other number to exit.```
Huge numbers.... No matter how many times I run it, even with srand, the numbers are about the same...
Could anyone tell me what's wrong with my code, please?
• 02-27-2006
spydoor
Make sure you initialize all your array elements to zero.
• 02-27-2006
limitedmage
Now it works perfectly! Thanks! I've always overlooked that... I've just started learning to program, anyway.
• 02-27-2006
CrazedBrit
Also you will never have a total of one because the lowest roll for each die is a one, and one plus one is two.