uppercase c 2b

1#include<bits/stdc++.h> 
2using namespace std; 
3  
4int main() 
5{ 
6    string s = "Viet Nam"; 
7    transform(s.begin(), s.end(), s.begin(), ::toupper);  //uppercase
8    cout << s << endl; 
9    return 0; 
10}
11

1#include <cctype>
2#include <iostream>
3#include <cstring>
4#include <cstdio>
5
6using namespace std;
7
8int main()
9{
10    char str[] = "John is from USA.";
11
12    cout << "The uppercase version of \"" << str << "\" is " << endl;
13
14    for (int i=0; i<strlen(str); i++)
15        putchar(toupper(str[i]));
16    
17    return 0;
18}

1#include <iostream>
2#include <string>
3using namespace std;
4
5int main()
6{
7    char letter;
8
9    cout << "You will be asked to enter a character.";
10    cout << "\nIf it is a lowercase character, it will be converted to uppercase.";
11    cout << "\n\nEnter a character. Press . to stop: ";
12
13    cin >> letter;
14
15    if(islower(letter))
16    {
17        letter = isupper(letter);
18        cout << letter;
19    }
20
21    while(letter != '.')
22    {
23        cout << "\n\nEnter a character. Press . to stop: ";
24        cin >> letter;
25
26        if(islower(letter))
27        {
28            letter = toupper(letter);
29            cout << letter;
30        }
31    }
32
33    return 0;
34}
35