calling conventions and using an override class to change another classes values, C++ (vc++)

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#include <stdio.h>
#include <string.h>

class test{

public:
    int i = 4;
    void thiscallfunc(int,test);
};
class test2{
    public:
    int p = 5;
    void thiscallfunc(int,test);
};
/*

*/
void test::thiscallfunc(int o, test t)
{
    i = o + t.i;
}
void test2::thiscallfunc(int l, test t)
{
    p = l;
}

int _fastcall fastfunc(int a,int b, int c, float d, float e){
    return a+b+c+3-d+e;
}
int _stdcall stdfunc(int a,int b, int c, float d, float e){
    return a+b+c+4-d+e;
}
int _cdecl cfunc(int a,int b, int c, float d, float e){
    return a+b+c+5-d+e;
}

int main()
{
    int x,y,z;
    test t;
    test t2;
    t2.i = 500;
    //t2 interpreted as test2 class instead of test class, this function calling happens on addreses of test2, i hope
    test2* t2p = (test2*)&t2;

//these 2 functions differ
    t2p->thiscallfunc(2000,t);
    t.thiscallfunc(10,t);

printf("t2 value: %i",t2.i);
    //yo
    x=fastfunc(1,4,7,5.0,1.0);
    y=stdfunc(2,5,8,10.0,1.0);
    z=cfunc(3,6,9,5.0,2.0);
    x += 1;
    y += 2;
    z += 3;
}

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Compilation time: 1,2 sec, absolute running time: 0,33 sec, absolute service time: 1,54 sec

calling conventions and using an override class to change another clas...