Dev - C++ - Programa para contar e imprimir las vocales en un arreglo de 20 letras

#include <iostream>

#include <cctype>   // toupper

using namespace std;

int main()

{

    int a = 0, e = 0, i = 0, o = 0, u = 0;

    char cadena[20];

    cout << "\nCadena: "; cin >> cadena;

    int k = 0;

    while (cadena[k] != '\0')

    {

        cadena[k] = toupper(cadena[k]);

        if (cadena[k] == 'A') a++;

        else if (cadena[k] == 'E') e++;

        else if (cadena[k] == 'I') i++;

        else if (cadena[k] == 'O') o++;

        else if (cadena[k] == 'U') u++;

        k++;

    }

    cout << "\nA: " << a;

    cout << "\nE: " << e;

    cout << "\nI: " << i;

    cout << "\nO: " << o;

    cout << "\nU: " << u;

    cout << endl;

    return 0;

}