Tolower funciton in cpp

Convert whole string to lowercase c++

#include<bits/stdc++.h> 
using namespace std; 
main() { 
    string s = "Viet Nam"; 
    transform(s.begin(), s.end(), s.begin(), ::tolower);  //lowercase
    cout << s << endl; 
}

Tolower funciton in cpp

transform(s.begin(), s.end(), s.begin(), ::tolower);

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