tr lowercase uppercase
tr '[:lower:]' '[:upper:]'
convert uppercase to lowercase
// 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; }
Source: www.geeksforgeeks.org