How to learn stack and flow of function call and control in cpp

/*How to learn stack. Stack is memory in which Last in first out is followed.
When function call is encountered the address of the next statement is stored or pushed in the stack. When the control returns back from the definition to calling function the address is poped out which is nothing but the statement next to the function call and executed.*/
#include<stdio.h>
#include<iostream>
using namespace std;
void function1();
void function2();

int main()
{
printf("1\n");
printf("2\n");
function1();
printf("3\n");
printf("4\n");

return 0;
}
void function1()
{
printf("1.1\n");
printf("1.2\n");
function2();
printf("1.3\n");
printf("1.4\n");
}
void function2()
{
printf("2.1\n");
printf("2.2\n");
}

How to learn recursive function call in cpp/C++/C

/*How to learn recursive function call in cpp/C++/C
 Cpp Program to learn recursive function */
#include<iostream>
using namespace std;
int sum(int m, int k);
int main()
{
int i,m,k;
m=3;
k=2;
i=sum(m,k);
cout<<"sum="<<i<<endl;
//return 0;
}
int sum(int rm, int rk)
{
cout<<rm<<" "<<rk<<endl;
if(rm==0) return(rk);//termination condition
else return(1+sum(rk, rm-1));//recursive condition//if not +1 then sum=0
}

C++ Program for Fibonacci series

//C++ Program for Fibonacci series
//cpp program to find fibonacci series
#include<iostream>
using namespace std;
int main()
{
   int n, first = 0, second = 1, next;
   cout << "Enter the number of terms of Fibonacci series you want " << endl;
   cin >> n;
    cout << "Fibbonacci Series of first "<<n<<"numbers is = " <<endl;
    for ( int i = 0 ; i < n ; i++ )
       {
     if ( i <= 1 )
         next = i;
      else
      {
         next = first + second;
         first = second;
         second = next;
      }
      cout<<next<<endl;
   }
   return 0;
}

//How to find fibonacci Series in C++/Cpp
//How to find fibonacci Series in C++/Cpp
//C++ program for fibonacci Number
 //How to find fibonacci Series in C++/Cpp
//How to find fibonacci Series in C++/Cpp
//C++ program for fibonacci Number

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