Dev - C++ - ejercicio que permita introducir numero de identificación notas de 50 alumnos anual sacar promedio

#include <iostream>

int not1

int not2

int not3

int not4

int not5

int not6

int not7

int not8

int not9

int not10

int not11

int not12

int not13

int not14

int not15

int not16

int not17

int not18

int not19

int not20

using namespace std;

int main(){

	cout<<"Ingrese su Cedula:"; cin>>CI1;

	cout<<"Ingrese su Cedula2:"; cin>>CI2;

	cout<<"Ingrese su Cedula3:"; cin>>CI3;

	cout<<"Ingrese su Cedula4:"; cin>>CI4;

	cout<<"Ingrese su Cedula5:"; cin>>CI5;

	cout<<"Ingrese su Cedula6:"; cin>>CI6;

	cout<<"Ingrese su Cedula7:"; cin>>CI7;

	cout<<"Ingrese su Cedula8:"; cin>>CI8;

	cout<<"Ingrese su Cedula9:"; cin>>CI9;

	cout<<"Ingrese su Cedula10:"; cin>>CI10;

	cout<<"Ingrese su Cedula11:"; cin>>CI11;

	cout<<"Ingrese su Cedula12:"; cin>>CI12;

	cout<<"Ingrese su Cedula13:"; cin>>CI13;

	cout<<"Ingrese su Cedula14:"; cin>>CI14;

	cout<<"Ingrese su Cedula15:"; cin>>CI15;

	cout<<"Ingrese su Cedula16:"; cin>>CI16;

	cout<<"Ingrese su Cedula17:"; cin>>CI17;

	cout<<"Ingrese su Cedula18:"; cin>>CI18;

	cout<<"Ingrese su Cedula19:"; cin>>CI19;

	cout<<"Ingrese su Cedula20:"; cin>>CI20;

return 0

}

#include <iostream>

main ()

{

    int c;

    printf ("\n imprimir si el alumno es competente o no competente");

    printf ("\n introduce una calificacion");

    scanf ("%d",&c);

    if (c<=7)

        printf ("\n no competente",c);

    else

        printf ("\n competente");

}

#include <iostream>

using namespace std;

int main() {

    int i;

    float suma=0,promedio=0,notaAnual;

    float mayor=0;

    const int ALUMNOS = 50;

    //Ingreso de notas

    for (i=1; i<=ALUMNOS; i++) {

        cout << "Ingrese nota final del alumno " << i <<": ";

        cin >> notaAnual;

        if (notaAnual > mayor)

            mayor = notaAnual;

        //promedio

        suma = suma + notaAnual;

    }

    promedio = suma / ALUMNOS;

    cout << endl << "La nota promedio es " << promedio << endl;

    cout << "La nota mayor es " << mayor;

    return 0;

}