having issue with random number and arrays

[theMadMonster]

so i am supposed to have a program that creates random numbers between 1 and 10, assign the numbers to an array and then give the sum of all numbers. My question is why am i getting weird numbers?

#include <iostream>
using std::cout;
using std::endl;

#include <iomanip>
using std::setw;

#include <ctime>
using std::time;

#include <cstdlib>
using std::rand;
using std::srand;


void randArray( int[], int );
void sumArray( int[], int );


int main()
{
const int arraySize = 10; // constant array size
int a[ arraySize ] = {0}; //setting array a to all 0's

for ( int i = 0; i < arraySize; i++ )
cout << a[i] << endl;


randArray(a, arraySize); //passing array a to randArray by reference
sumArray(a, arraySize); //passing array a to sumArray by reference

return 0;

}

//creates 10(based on arraysize from main) random numbers from 1 to 10

void randArray( int b[], int size ) //points to original array a
{
srand( time (0));

for ( int roll = 0; roll < size; roll++ )
cout << "randon numbers are: " << b[ 1 + rand() % 10 ]++ << endl;
}

//creates to total sum of array a

void sumArray ( int c[], int secSize )
{
int total = 0;
for ( int sum = 0l; sum < secSize; sum++ )
total += c[sum];
cout << "Total of all random numbers is: " << total << endl;

}

output looks like this:

random numbers are: 0
random numbers are: 0
random numbers are: 0
random numbers are: 0
random numbers are: -858993460
random numbers are: 1
random numbers are: 0
random numbers are: 1
random numbers are: 0
random numbers are: 2
Total of all random numbers is: 9

I get this over and over again with different numbers. Sometimes I get numbers like -858993460 a few times and an error that says:

run time check failure #2 - stack around the variable 'a' was corrupted.

[firedraco]

Your randArray function does not actually do what you think it does.

You are accessing the 1-10th (10 is not a valid index for this array) element.

[theMadMonster]

I see that I had the wrong number for arraySize, it should have been 11 instead of 10. After changing that I no longer get negative numbers but now all I get are 0, 1, and 2.

[firedraco]

Your randArray function still does not actually do what you think it does.

You are accessing a random element and then incrementing it. You aren't assigning the random number to part of the array.

[theMadMonster]

got it now, thanks.

for ( roll = 0; roll < size; roll++)
b[roll] = (rand() % 10) + 1;