Help learning C++

For those who know C++, could you do me a favor and post some code samples for me? I learn best by dissecting code, but I'm finding it difficult to find code that is my level (i'm a total noob).

>>1
double foo(double (*procedure)(double,double),int from,int to)
{
    if(from>to)
        return 0;
    else
        return procedure(foo(procedure,from+1,to),from);
}

If you don't understand, quit the internet forever.

double foo(double (*procedure)(double,double),int from,int to)
{
    if(from>to)
        return 0;
    else
        return procedure(foo(procedure,from+1,to),(double)from);
}

mea culpa


double foo(double (*procedure)(double,double),int from,int to)
{
    if(from>to)
        return 0;
    else
        return procedure(foo(procedure,from+1,to),(double)from);
}
Better