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We have been given an array, which contains random numbers, including zero. We have to move all zeros at the end of the array.
Key Point: Move element when scan, put zeros after dest pointer.
http://www.geeksforgeeks.org/move-zeroes-end-array/

void pushZerosToEnd(int arr[], int n)

{

    int count = 0;  // Count of non-zero elements

    // Traverse the array. If element encountered is non-zero, then

    // replace the element at index 'count' with this element

    for (int i = 0; i < n; i++)

        if (arr[i] != 0)

            arr[count++] = arr[i]; // here count is incremented Can be improved to avoid unnecessary assignement

    // Now all non-zero elements have been shifted to front and 'count' is

    // set as index of first 0. Make all elements 0 from count to end.

    while (count < n)

        arr[count++] = 0;

}

void move_zeroes(int a[], int size){

int i, dest = 0;

for(i =0; i<size; i++){

if(a[i] != 0){

a[dest++] = a[i];

}

}

for(i= dest; i<size; i++){

a[i] = 0;

}

printf("\n");

for(i= 0; i<size; i++){

printf("%d ", a[i]);

}

}

http://comproguide.blogspot.com/2013/10/moving-zeroes-to-end-of-array.html
The algorithm is simple, we take two  indices , one to loop through the entire array, and another to keep track of the non-zero elements. Once we loop through all the elements, we can fill the remaining spaces with zeros.

    public static void moveZerosToEnd(int[] array)


    {


        int resInd = 0;// to keep track of non-zero elements in the final array


        int i;


        for( i = 0; i < array.length; i++ )


        {


            if( array[i] > 0 )


            {


                if( i != resInd ) //Avoid self copy


                    array[resInd] = array[i];


                resInd++;


            }


        }


        //Fill the remaining entries with 0


        while( resInd < array.length )


        {


            array[resInd] = 0;


            resInd++;


        }


    }

Read full article from Algorithms and Me: Arrays : Move all zeros at the end of the array