Question

Ask the user for a string with some uppercase letters and some lowercase letters. Write a function called ChangeCase that prints a new string in which the uppercase letters are changed to lowercase and lowercase to uppercase. in c++

Answer 1

#include <iostream>
#include <string>

using namespace std;

void ChangeCase(string s) {
    char ch;
    for (int i = 0; i < s.size(); ++i) {
        ch = s[i];
        if (ch >= 'a' && ch <= 'z') {
            ch -= 32;
        } else if (ch >= 'A' && ch <= 'Z') {
            ch += 32;
        }
        cout << ch;
    }
    cout << endl;
}

int main() {
    string s;
    cout << "Enter a string:" << endl;
    getline(cin, s);
    ChangeCase(s);
    return 0;
}