In C++, function strlwr() is used to convert a string to lowercase and function strupr() is used to convert string to uppercase.
The following code demonstrates how to use these two functions:
#include <string>
#include <iostream>
using namespace std;
int main(void)
{
char name[80]; /* declare an array of characters 0 – 79 */
memset(name,0, sizeof(name));
cout << "Enter in a name in lowercase:";
cin >> name;
strupr(name);
cout << "The name in uppercase is: " << name << endl;
strlwr(name);
cout << "The name in lowercase is: " << name << endl;
return 0;
}