Описать структуру с именем Student

#include<iostream>
#include<string>
using namespace std;
 
struct student {string fio;
int marks[5];
double sr_ball;} gr[25];
 
int main() 
{int i,s,k;
for (i=0; i<25; i++){
        getline(cin,gr[i].fio,'.');
        s=0;
for (k=0; k<5; k++)
    { cin >> gr[i].marks[k];
    s=s+gr[i].marks[k];}
    gr[i].sr_ball = (double) s/5;
        cout << endl;
for (i=0; i <25; i++)
if (gr[i].sr_ball >=4)
            cout << gr[i].fio <<"  "<< gr[i].sr_ball << endl;
else cout <<"takih studentov net"<< endl;}
system ("pause");}

#include <iostream>
#include <cstring>
 
const size_t studentsCount(10);
const size_t marksCount(5);
 
struct Student
{
    int studentGroup;
    std::string studentName;
    int studentMarks[marksCount];
};
 
int main()
{
    Student studentsData[studentsCount];
    std::cout << "Input the information about " << studentsCount << " students: " << std::endl;
    for (unsigned i = 0; i < studentsCount; i++) {
        std::cout << (i + 1) << ")" << std::endl;
        std::cout << "Name: ";
        std::getline(std::cin, studentsData[i].studentName);
        std::cout << "Group: ";
        std::cin >> studentsData[i].studentGroup;
        std::cout << "Input " << marksCount << " marks: ";
        for (unsigned j = 0; j < marksCount; j++)
            std::cin >> studentsData[i].studentMarks[j];
 
        system("cls");
        std::cin.sync();
    }
 
    unsigned resultCounter(0);
    std::cout << "Result: " << std::endl;
    for (unsigned i = 0; i < studentsCount; i++) {
        unsigned currentSum(0);
        for (unsigned j = 0; j < marksCount; j++)
            currentSum += studentsData[i].studentMarks[j];
        if (((double)currentSum / (double)marksCount) > 4) {
            std::cout << studentsData[i].studentName << "(" << studentsData[i].studentGroup << " group)" << std::endl;
            resultCounter++;
        }
    }
    if (!resultCounter)
        std::cout << resultCounter << std::endl;
 
    return 0;
}

#include<iostream>
#include<string>
using namespace std;
 
struct student 
{
    string fio;
    int marks[5];
    double sr_ball;
} 
    gr[2];
 
int main() 
{
    int i,s,k;
    bool flag = true;
    for (i = 0; i < 2; i++)
    {
        getline(cin,gr[i].fio,'.');
        s = 0;
        for (k = 0; k < 5; k++)
        { 
            cin >> gr[i].marks[k];
            s = s + gr[i].marks[k];}
            gr[i].sr_ball = (double) s / 5.0;
    }
 
    for (i = 0; i < 2; i++)
        if (gr[i].sr_ball > 4)
        {
            cout << gr[i].fio <<" "<< gr[i].sr_ball << endl;
            flag = false;
        }
    if (flag) 
        cout <<"takih studentov net"<< endl;
    
    system ("pause");
}