function_declaration_difference

//if you declare a function as a prototype before you define the function, you have to define the parameters
#include <iostream>
using namespace std;

void PrintSomething(int x); 
/*the int x part here is vital. The program won't be compiled otherwise if the parentheses are empty*/

int main()
{
     PrintSomething(42);
     return 0;
}

void PrintSomething(int x)
{
     cout << x << " is a variable." << endl;
}

/////////////////////////////////////////////////////////////////////////////
// difference function paramters

#include <iostream>
using namespace std;

int sum(int x, int y)

return x+ y;


// Here int x, int y are parameters
/* The function sum takes in these values and then returns their sum.
*/

int main()
{

int a  = 2;
int b = 3;

cout<<sum(a,b)<<endl;

/*  Here, a and b are arguments as you are entering the values which will be considered as x and y when the function sum() is run. */
return 0;
}