Help with assignment please!!!

[burnout]

Hi, I am taking a programming class and I am a terrible programmer! the assignment is this:

http://condor.depaul.edu/~ntomuro/courses/262/assign/hw1.html

I really am having trouble I started the program but couldnt even finish it because I am pretty sure I am doing everything wrong! I didnt even know how to do 2 of the functions and I think all my other functions are wrong as well. I really need help! this is my code:

#include<iostream>
using namespace std;

// prototypes

void fillArray(int ar[], int size, int inc);
void printArray(int ar[], int size);
void mergeArrays(int a1[], int size1, int a2[], int size2, int a3[]);
void shuffle(int ar[], int size);
int indexOfMinimum(int ar[], int size);
void reverseArray(int ar[], int size);

int main()
{
// declare arrays
int ar1[5];
int ar2[4];
int ar3[9];
int inc1;
int inc2;
cout << "Enter the first value and increment for ar1: ";
cin >> ar1[0] >> inc1;
cout << "Enter the second value and increment for ar2: ";
fillArray(ar1, 5, inc1);
cin >> ar2[0] >> inc2;
fillArray(ar2, 4, inc2);
printArray(ar1, 5);
printArray(ar2, 4);


system ("pause");
return 0;
}

void fillArray(int ar[], int size, int inc)
{
for (int i = 0; i < size; i++)
cin >> ar[i];
}


void printArray(int ar[], int size)
{
cout << "ar1:" << endl;
cout << ar << endl;
}

void mergeArrays(int a1[], int size1, int a2[], int size2, int a3[])
{

}

void shuffle(int ar[], int size)
{

}

int indexOfMinimum(int ar[], int size)
{
int min=ar[0];
int minidx=0;
for (int i = 1; i < size; i++)
{
if (ar[i] < min)
min = ar[i];
minidx=i;
}

return minidx;
}

void reverseArray(int ar[], int size)
{

}

[psault]

#include <iostream.h>
#include <stdlib.h>

void fillArray(int* ar, int size, int inc);
void printArray(int* ar, int size);
void mergeArrays(int a1[], int size1, int a2[], int size2, int* a3);
void shuffle(int* ar, int size);
int indexOfMinimum(int ar[], int size);
void reverseArray(int* ar, int size);

int main() {
  int ar1[5], ar2[4], ar3[9];
  int inc1, inc2;
  cout << "Enter the first value and increment for ar1: ";
  cin >> ar1[0] >> inc1;
  cout << "Enter the first value and increment for ar2: ";
  cin >> ar2[0] >> inc2;
  fillArray(ar1, sizeof(ar1)/4, inc1);
  fillArray(ar2, sizeof(ar2)/4, inc2);
  cout << endl;
  cout << "ar1:" << endl;
  printArray(ar1, sizeof(ar1)/4);
  cout << endl << endl;
  cout << "ar2:" << endl;
  printArray(ar2, sizeof(ar2)/4);
  cout << endl << endl;
  mergeArrays(ar1, sizeof(ar1)/4, ar2, sizeof(ar2)/4, ar3);
  cout << "ar3:" << endl;
  printArray(ar3, sizeof(ar3)/4);
  cout << endl << endl;
  shuffle(ar3, sizeof(ar3)/4);
  cout << "ar3 after shuffle:" << endl;
  printArray(ar3, sizeof(ar3)/4);
  cout << endl << endl;
  cout << "Index of the minimum element is: " << indexOfMinimum(ar3, sizeof(ar3)/4) << endl;
  cout << endl;
  cout << "ar3 after reverse: " << endl;
  reverseArray(ar3, sizeof(ar3)/4);
  printArray(ar3, sizeof(ar3)/4);
  cout << endl << endl;
  return 0;
}

void fillArray(int* ar, int size, int inc) {
  for (int i=1;i<size;i++) ar[i]=ar[i-1]+inc;
}

void printArray(int ar[], int size) {
  for (int i=0;i<size;i++) cout << ar[i] << " ";
}

void mergeArrays(int a1[], int size1, int a2[], int size2, int* a3) {
  for (int i=0;i<size1;i++) a3[i]=a1[i];
  for (int i=size1;i<size1+size2;i++) a3[i]=a2[i-size1];
}

void shuffle(int* ar, int size) {
  int idx1, idx2, num;
  for (int i=0;i<size;i++) {
    idx1=rand()%size;
    idx2=rand()%size;
    num=ar[idx1];
    ar[idx1]=ar[idx2];
    ar[idx2]=num;
  }
}

int indexOfMinimum(int ar[], int size) {
  int min=ar[0], idx;
  for (int i=0;i<size;i++) if (ar[i]<min) {
    min=ar[i];
    idx=i;
  }
  return idx;
}

void reverseArray(int* ar, int size) {
  int num, j=0;
  for (int i=size-1;i>=j;i--) {
    num=ar[j];
    ar[j]=ar[i];
    ar[i]=num;
    j++;
  }
}

[burnout]

thanks!