Conversion of whole String to uppercase or lowercase using STL in C++

Given a string, convert the whole string to uppercase or lowercase using STL in C++.

Examples:

For uppercase conversion
Input : s = "String"
Output : s = "STRING"

For lowercase conversion
Input : s = "String"
Output : s = "string"

Functions used :
transform : Performs a transformation on given array/string.
toupper(int c) : Returns upper case version of character c. If c is already in uppercase, return c itself.
tolower(int c) : Returns lower case version of character c. If c is already in lowercase, return c itself.

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// C++ program to convert whole string to
// uppercase or lowercase using STL.
#include<bits/stdc++.h>
using namespace std;
  
int main()
{
    // su is the string which is converted to uppercase
    string su = "Jatin Goyal";
  
    // using transform() function and ::toupper in STL
    transform(su.begin(), su.end(), su.begin(), ::toupper);
    cout << su << endl;
  
    // sl is the string which is converted to lowercase
    string sl = "Jatin Goyal";
  
    // using transform() function and ::tolower in STL
    transform(sl.begin(), sl.end(), sl.begin(), ::tolower);
    cout << sl << endl;
  
    return 0;
}

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Output:

JATIN GOYAL
jatin goyal

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