Не понимаю ошибку invalid conversion from 'int' to 'int*

#include <iostream>
#include <cstdlib>
 
using namespace std;
 
int swap (int *a, int *b, int *c)
{
    int temp=*a;
    *a=*b;
    *b=*c;
    *c=temp;
    //cout<<temp;
    return 0;
}
 
 
int main() 
{
    int ca,cb,cc;
    cout<<"Vedite 1 chislo \n";
    cin>>ca;
    cout<<"Vedite 2 chislo \n";
    cin>>cb;
    cout<<"Vedite 3 chislo \n";
    cin>>cc;
    int *prtca;
    prtca=&ca;
    int *prtcb;
    prtcb=&cb;
    int *prtcc;
    prtcc=&cc;
    swap (*prtca, *prtcb, *prtcc);
    cout<<ca<<endl;
    cout<<cb<<endl;
    cout<<cc<<endl;
     system("pause");
 
    return 0;
}

swap (*prtca, *prtcb, *prtcc);

swap (prtca, prtcb, prtcc);

#include <iostream>
#include <cstdlib>
 
using namespace std;
 
int swap (int *a, int *b) 
{
    *a=*a+*b;
    *b=*a-*b;
    *a=*a-*b;
    return 0;
}
 
 
int main() 
{
    int ca, cb;
    cout<<"Vedite 1 chislo \n";
    cin>>ca;
    cout<<"Vedite 2 chislo \n";
    cin>>cb;
    int *prtca=&ca;
    int *prtcb=&cb;
    swap(*prtca, *prtcb);
    cout<<ca<<endl;
    cout<<cb<<endl;
     system("pause");
 
    return 0;
}