Dev - C++ - Por favor ayuda, programacion en C

#include <iostream>

using namespace std;

int main()

{

    int k = 1;

    float calificacion, total = 0;;

    do{

        cout << "Calificacion " << k << ": ";

        cin >> calificacion;

        total += calificacion;

        k++;

    }while( k <= 5 );

    cout << "\nPromedio: " << total / 5 << endl;

    return 0;

}

#include <stdio.h>

int main()

{

    int k = 1;

    float calificacion, total = 0;;

    do{

        printf( "Calificacion %d: ", k );

        scanf( "%f", &calificacion );

        total += calificacion;

        k++;

    }while( k <= 5 );

    printf( "\nPromedio: %.2f\n", total / 5 );

    return 0;

}