example3_importing_namespaces.cpp

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#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
    string input;
    cout << "Enter a string: ";
    getline(cin, input);
    
    cout << "Original string: " << input << endl;
    
    transform(input.begin(), input.end(), input.begin(), ::toupper);
    cout << "Uppercase string: " << input << endl;
    
    return 0;
}