Function Parameter, and Function Parameter Constant

Question

anyone can tell me different about this code :

#include <iostream>
#include <string>

using namespace std;

string upc(string nn){
string tmp;
for(size_t i = 0; i < nn.length(); i++){
tmp += toupper(nn[i]);
}
return tmp;
}

int main(){
string nama = "program c++";
cout << "Nama : " << nama << endl;
cout << "upperCase : " << upc(nama) << endl;

string *nn = &nama;
*nn = "change program c++";
cout << "Pointer : " << upc(*nn) << endl;

return 0;
}

========================================================================
#include <iostream>
#include <string>

using namespace std;

string upc(const string nn){
string tmp;
for(size_t i = 0; i < nn.length(); i++){
tmp += toupper(nn[i]);
}
return tmp;
}

int main(){
string nama = "program c++";
cout << "Nama : " << nama << endl;
cout << "upperCase : " << upc(nama) << endl;

string *nn = &nama;
*nn = "change program c++";
cout << "Pointer : " << upc(*nn) << endl;

return 0;
}

Answer 1

Ok, i'll try it