Увеличение букв

#include <iostream>

using namespace std;

int main()
{
    char str[1000];
    int i = 0;
    cin.getline(str, 1000);
    while(str[i] != 0)
    {
        if(str[i] >= 'a' && str[i] <= 'z')
        {
           str[i] = str[i] - 32;
        }
        i++;
    }
    i = 0;
    while(str[i] != 0)
    {
        cout << str[i];
        i++;
    }
}