C++ program to print students details using structure

#include<iostream>
#include<conio.h>
#include<windows.h>

BOOL gotoxy(const WORD x, const WORD y) {
    COORD xy;
    xy.X = x;
    xy.Y = y;
    return SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), xy);
}

struct res
{
    int rn;
    char name[30];
    int math;
    int phy;
    int c;
};
struct res a[5];

int main()
{
   system("cls");

    int i;
    int total;
    int avg;

    for(i=0;i<=4;i++)
    {
        std::cout<<"Name = ";
        std::cin>>a[i].name;

        std::cout<<"Roll Number = ";
        std::cin>>a[i].rn;

        std::cout<<"Math Number = ";
        std::cin>>a[i].math;

        std::cout<<"Physics Number = ";
        std::cin>>a[i].phy;

        std::cout<<"C++ Number = ";
        std::cin>>a[i].c;
    }

    for(i=0;i<=4;i++)
    {
        total = a[i].math+a[i].phy+a[i].c;
        avg = total/3.0;
        gotoxy(20,5+i);

        std::cout<<a[i].name<<std::endl;

        gotoxy(30,5+i);

        std::cout<<a[i].rn<<std::endl;
        gotoxy(37,5+i);

        std::cout<<a[i].math<<std::endl;
        gotoxy(44,5+i);

        std::cout<<a[i].phy<<std::endl;
        gotoxy(51,5+i);

        std::cout<<a[i].c<<std::endl;
        gotoxy(58,5+i);

        std::cout<<total<<std::endl;
        gotoxy(65,5+i);

        std::cout<<avg<<std::endl;

        if(avg >= 80)
        {
            gotoxy(73,5+i);
            std::cout<<"A"<<std::endl;
        }
        else if(avg >= 70 && avg <= 79)
        {
            gotoxy(73, 5+i);
            std::cout<<"B"<<std::endl;
        }
        else if(avg >= 60 && avg <= 69)
        {
            gotoxy(73,5+i);
            std::cout<<"C"<<std::endl;
        }
        else if(avg >= 50 && avg <= 59)
        {
            gotoxy(73,5+i);
            std::cout<<"C"<<std::endl;
        }
        else
        {
            gotoxy(73,5+i);
            std::cout<<"Fail"<<std::endl;
        }
    }

    gotoxy(20,4);
    std::cout<<"Name"<<std::endl;
    gotoxy(30,4);
    std::cout<<"Roll"<<std::endl;
    gotoxy(37,4);
    std::cout<<"Math"<<std::endl;
    gotoxy(44,4);
    std::cout<<"Phy"<<std::endl;
    gotoxy(51,4);
    std::cout<<"C++"<<std::endl;
    gotoxy(58,4);
    std::cout<<"Total"<<std::endl;
    gotoxy(65,4);
    std::cout<<"Aver"<<std::endl;
    gotoxy(73,4);
    std::cout<<"Grade"<<std::endl;

    getch();
    return 0;
}

Name = yashpal
Roll Number = 5
Math Number = 50
Physics Number = 70
C++ Number = 80
Name = yash
Roll Number = 6
Math Number = 70
Physics Number = 90
C++ Number = 80
Name = rahul
Roll Number = 7
Math Number = 80
Physics Number = 80
C++ Number = 80
Name = pooja
Roll Number = 8
Math Number = 80
Physics Number = 90
C++ Number = 100
Name = Kajal
Roll Number = 9
Math Number = 70
Physics Number = 70
C++ Number = 70

Name     Roll    Math    Phy     C++     Total   Aver    Grade
yashpal  5       50      70      80      200     66      C
yash     6       70      90      80      240     80      A
rahul    7       80      80      80      240     80      A
pooja    8       80      90      100     270     90      A
kajal    9       70      70      70      210     70      B