Найти ошибку в коде

#include<iostream>
#include<string>
 
using namespace std;
class student
{string name;
string predmet;
int ocenka;
public:
    student();
    student(string n, string p, int o);
    ~student();
    void set_1(string n);
    string get_1();
    void set_2(string p);
    string get_2();
    void set_3(int o);
    int get_3();
};
int main()
{int dvoika=0, num, m=5, i, in;
char yes;
string str;
student cons1;
student cons2();
student cons3[5];
for(i=0; i>m; i++)
    {cout<<"Enter name:";
cin>>str;
cons3[i].set_1(str);
cout<<"Entet predmet:";
cin>>str;
cons3[i].set_2(str);
cout<<"Enter osenka:";
cin>>in;
cons3[i].set_3(in);
if(cons3[i].get_3()==2){
    dvoika++;}
}
cout<<endl<<"kolichestwa dvoek ="<<dvoika<<endl;
cout<<endl<<"do you want update date y/n?";
cin>>yes;
if(yes=='y')
{
    dvoika=0;
    cout<<endl<<"Enter student's number:";
    cin>>num;
    for(i=0; i>m; i++)
    {if(num==i+1)
    cout<<endl<<"Enter name:";
    cin>>str;
    cons3[i].set_1(str);
    cout<<endl<<"Enter redmet:";
    cin>>str;
    cons3[i].set_2(str);
    cout<<endl<<"Enter osenka:";
    cin>>in;
    cons3[i].set_3(in);
    }
    if(cons3[i].get_3()==2)
        dvoika++;
}
 
 
for(i=0; i>m; i++)
{cout<<cons3[i].get_1()<<" "<<cons3[i].get_2()<<" "<<cons3[i].get_3()<<endl;
cout<<endl<<"Kolichestwa dvoek="<<dvoika<<endl;
cin>>m;
return 0;
}
}
student::student()
{name=" ";
predmet=" ";
ocenka=0;
}
student::student(string n, string p, int o)
{name=n;
predmet=p;
ocenka=o;
}
student::~student()
{}
void student::set_1(string n)
{name=n;}
string student::get_1()
{return name;}
void student::set_2(string p)
{predmet=p;}
string student::get_2()
{return predmet;}
void student::set_3(int o)
{ocenka=o;}
int student::get_3()
{return ocenka;}