# Trouble with Arrays

• 10-08-2009
blurx
Trouble with Arrays
I'm not understanding how to count the frequency of an array element so I basically did the long version. From what I understand, I am suppose to make an array of eleven elements to mirror the 11 variables and somehow increment those? How exactly do I print out that frequency of the array elements then?

The code below is the long version that I'm trying to convert to using arrays. This is just a basic program to simulate 1000 trials of 10 flips and seeing how many times it lands on hands during the trials.

Code:

```int main(void){         int zero=0, one=0, two=0, three=0, four=0, five=0, six=0, seven=0, eight=0, nine=0, ten=0;     int numheads;     int trialnum = 1000;     int flipnum = 10;     int i, j, k;     int a;     int random;         srand((unsigned)time(NULL));         for(i = 0; i < trialnum; i++){                     numheads = 0;                     for(j = 0; j < flipnum; j++){                 if( (random = rand()) > (RAND_MAX / 2)) numheads++;           }                     if(numheads == 0) zero++;           if(numheads == 1) one++;           if(numheads == 2) two++;           if(numheads == 3) three++;           if(numheads == 4) four++;           if(numheads == 5) five++;           if(numheads == 6) six++;           if(numheads == 7) seven++;           if(numheads == 8) eight++;           if(numheads == 9) nine++;           if(numheads == 10) ten++;               }     getchar();      return 0; }```
• 10-08-2009
quzah
Code:

```int array[ ARRAYSIZE ]; /* declare an array with ARRAYSIZE members */ array[ 0 ] = 1; /* set the first array member to 1. arrays start at 0 */ array[ ARRAYSIZE - 1 ] = 5; /* set the last member to 5 */ array[ ARRAYSIZE ] = ERROR; /* this member does not exist and is an error */```
Edited: array in the last three lines was incorrectly listed as arraysize

Quzah.
• 10-08-2009
blurx
Quote:

Originally Posted by quzah
Code:

```int array[ ARRAYSIZE ]; /* declare an array with ARRAYSIZE members */ arraysize[ 0 ] = 1; /* set the first array member to 1. arrays start at 0 */ arraysize[ ARRAYSIZE - 1 ] = 5; /* set the last member to 5 */ arraysize[ ARRAYSIZE ] = ERROR; /* this member does not exist and is an error */```

Quzah.

Are you saying I need two arrays? The two 'arraysize' text confuses me.
• 10-08-2009
quzah
Sorry, replace 'arraysize' in the last three lines with 'array'.

Quzah.
• 10-08-2009
```int tally[11] = {0,0,0,0,0,0,0,0,0,0,0}; //put in your other code here, now let's tally up tally[numheads]++;```
` {0,0,0,1,0,0,0,0,0,0,0}`