addition function

#include <iostream>
#include<iomanip>
using namespace std;


int fun2(int ,int ,int );

int main() {
    int a,b,c;
    cout<<"enter three numbers"<<endl;
    cin>>a>>b>>c;
   cout<<fun2;
  

    return 0;
}

int fun2(int a,int b,int c){
    cout<<a-b+c;
    return 0;
}