using namespace std;
int a=56,b=56,c=56;
int passbyvalue(int x);
void passbyreference(int &x);
void passbypointers(int *x);
int main(){
cout<<endl<<"the program will tell three ways to use functions to store value "<<endl;
cout<<" 1 = Pass by value"<<endl<<" 2 = pass by reference "<<endl<<" 3 = pass by pointers "<<endl;
cout<<"-------------------------------------------------------------------------------"<<endl;
cout<<" the value of a now = "<<a<<endl<<"and after passbyvalue "<<endl;
a=passbyvalue(a);
cout<<"the value of a now = "<<a<<endl;
cout<<"-------------------------------------------------------------------------------"<<endl;
cout<<" the value of b now = "<<b<<endl<<"and after passbyreference "<<endl;
passbyreference(b);
cout<<"the value of b now = "<<b<<endl;
cout<<"-------------------------------------------------------------------------------"<<endl;
cout<<" the value of c now = "<<c<<endl<<"and after passbypointers "<<endl;
passbypointers(&c);
cout<<"the value of c now = "<<c<<endl;
cout<<"-------------------------------------------------------------------------------"<<endl;
}
int passbyvalue(int x){
x*=2;
return x;
}
void passbyreference(int &x){
x*=2;
}
void passbypointers(int *x){
*x*=2;
}
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