I'm getting this error. [Error] extra qualification 'Coin::' on member 'toss' [-fpermissive]

Here's my code:

#include

#include

#include

#include

using namespace std;

int sum=0;

class Coin

{

int sideUp;

public:

Coin(int value)

{

toss(value);

};

void Coin::toss(int value)

{

if(rand() %100<=50)

{

sum+=value;

cout<<" You got a head. Value "<

}

else

{

cout<<" You got a tail. No value added";

}

}