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Error: expected unqualified-id before '.' token

yevo (2)
Good evening. I am doing an assignment for my class. I am using codeblock. My assigment is to implement a circular queue. My code is below, as well the error. From reading previous forum it seems is a syntax error but I cant tell what wrong with that lines.

Error:
E:\CodeBlocks\cirstack.cpp||In function 'int main()':|
E:\CodeBlocks\cirstack.cpp|126|error: expected unqualified-id before '.' token|
E:\CodeBlocks\cirstack.cpp|127|error: expected unqualified-id before '.' token|
E:\CodeBlocks\cirstack.cpp|128|error: expected unqualified-id before '.' token|
||=== Build finished: 3 errors, 0 warnings (0 minutes, 0 seconds) ===|


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#include <iostream>

using namespace std;

class CircStack
{
    public:
        CircStack(int cap); // stack capacity
        void push(double d); // push new number on stack
        double pop(); // remove and return a double
        double peek(); // return stack top without removing
        int size(); // return how many elements on stack

    private:
        double *data; // pointer to array of doubles
        int capacity; // the size of the array
        int top; // index of next open spot
        int bottom; //index of the deletion
        int count; // number of items on stack
};
//Class Implementation

//Capacity parameter
CircStack::CircStack (int cap)
{
    capacity=cap;

    cout << "The Capacity of the Circular Buffer is: " << capacity << endl;

    //Allocating a pointer to the array (data)
    top = bottom = -1;
    CircStack::capacity = capacity- 1;
    data = new double[cap];
    count = 0;

    for(int i = 0; i <= cap; i++)
        {
    	data[i] = 0;
        }

    //showing staring point
    for ( int i = 0; i < 5; i++ )
        {
            cout << data[i] << " ";
        }

}

//Push number into stack
void CircStack::push(double d)
{
    if (top == 0 && bottom == capacity || top == bottom + 1)
    {
        cout << "Queue is full\n";
    }
	else if (top == -1 && bottom == -1)
    {
	    top = 0;
	    bottom = 0;
	    data[top] = d;
	    count++;
    }
    else if (bottom == capacity)
    {
    	bottom = 0;
    	data[bottom] = d;
    	count++;
    }
    else
    {
    	bottom++;
    	data[bottom] = d;
    	count++;
    }
}

//remove a number
double CircStack::pop()
{

    if (top == -1 && bottom == -1)
    {
        cout << "Queue is empty\n";
    }

    else
    {
        if (top == bottom)
            {
	    data[top] = 0;
	    top = -1;
	    bottom = -1;
	    count--;
            }

        else if (top == capacity)
        {
            data[top] = 0;
            top = 0;
            count--;
        }
        else
        {
	    data[top] = 0;
	    top++;
	    count--;
        }
    }
}

//return top of stack
double CircStack:: peek()
{
    cout << data[4];
}

//return how many number on stack
int CircStack:: size()
{
    cout<< count;
}

int main()
{
    CircStack cap(5);
    CircStack.push(5.0);
    CircStack.size();
    CircStack.peek();

    return 0;
}
Peter87 (11234)
Call the function on the variable, not on the class.
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CircStack cap(5);
cap.push(5.0);
cap.size();
cap.peek();

minomic (226)
After you instantiate an object (at line 125) you have to call the methods on the instance. This means

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cap.push(...);
cap.size();
...
yevo (2)
Thank you. Peter87 and minomic.
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