CPP

c++ call by reference

#include <iostream>

using namespace std;

void increment(int &n){
    n++;
   cout<<"In function: "<<n<<endl; 
}

int main()
{
   int x=5;
   increment(x);
   cout<<"In main: "<<x<<endl;
   
}

calling by reference c++

void fun2(int& a) 
{
    a = 5;
}

int main()
{
    int b = 10;
    fun2(b); 

    // now b = 5;
    return 0;
}

calling by reference c++

int main() {
    int b = 1;
    fun(&b);
    // now b = 10;
    return 0;
}

calling by reference c++

void fun(int *a)
{
   *a = 10;
}

calling by reference c++

void fun3(int a)
{
    a = 10;
}

int main()
{
    int b = 1;
    fun3(b);
    // b  is still 1 now!
    return 0;   
}