Hitung huruf vokal

#include <string.h>
#include <iostream>

using namespace std;

int main(){
    char s[256];
    int i=0;
    int jmlA=0, jmlI=0,
    jmlE=0, jmlU=0,
    jmlO=0;
    cout << "Masukkan nama :" << endl;
    gets(s);
    strlen(s);
    while(i!=strlen(s)){
        if(s[i]=='a') jmlA++;
        else if(s[i]=='i') jmlI++;
        else if(s[i]=='u') jmlU++;
        else if(s[i]=='e') jmlE++;
        else if(s[i]=='o') jmlO++;
        i++;
    }
    cout << "Jumlah Huruf A: " << jmlA<<endl;
    cout << "Jumlah Huruf I: " << jmlI<<endl;
    cout << "Jumlah Huruf E: " << jmlE<<endl;
    cout << "Jumlah Huruf U: " << jmlU<<endl;
    cout << "Jumlah Huruf O: " << jmlO<<endl;
    return 0;
}