Which of the following statement is correct about the program given below?

#include<iostream.h>
long GetNumber(long int Number)
{
    return --Number;
}
float GetNumber(int Number)
{
    return ++Number;
}
int main()
{
    int x = 20;
    int y = 30;
    cout<< GetNumber(x) << " ";
    cout<< GetNumber(y) ;
    return 0; 
}

#include<iostream.h> 
int main()
{
    float Amount;
    float Calculate(float P = 5.0, int N = 2, float R = 2.0);
    Amount = Calculate(); 
    cout<< Amount << endl; 
    return 0;
}

float Calculate(float P, int N, float R)
{
    int Year = 1;
    float Sum = 1 ;
    Sum = Sum * (1 + P * ++N * R);
    Year =  (int)(Year + Sum);
    return Year; 
}