Uppercase to lowercase in C++

#include <iostream>
using namespace std;
char uptolow(char c)
{
    if(c>='A'&&c<='Z')
    {
        return c+32;
    }
    return c;
}
int main()
{
    for(char c='A';c<='z';c++)
    {
        cout<<c<<"\t"<<(int)c<<"\t"<<uptolow(c)<<endl;
    }
}