Sir caractere - transformare litere

//litere mari-> mici
#include<iostream.h>
#include<conio.h>
#include<string.h>
int main()
{char sir[100];
cout<<"Introduceti sirul: "<<endl;
cin.get(sir,100);
strlwr(sir);
cout<<sir;
getche();}


//litere mici->mari
#include<iostream.h>
#include<conio.h>
#include<string.h>
int main()
{char sir[100];
cout<<"Introduceti sirul: "<<endl;
cin.get(sir,100);
strupr(sir);
cout<<sir;
getche();}