Write a program that inputs a line of text with istream member function getline (as in Chapter 15) into character array s[100]. Output the line in uppercase letters and lowercase letters.

Question

What will be an ideal response?

Answer 1

```
#include
#include
using namespace std;

const int SIZE = 100;

int main()
{
char s[ SIZE ];
int i;

cout << "Enter a line of text:\n";
cin.getline( s, SIZE );

cout << "\nThe line in uppercase is:\n";

// demonstrate function toupper
for ( i = 0; s[ i ] != '\0'; ++i )
cout << static_cast< char >( toupper( s[ i ] ) );

cout << "\n\nThe line in lowercase is:\n";

// demonstrate function tolower
for ( i = 0; s[ i ] != '\0'; ++i )
cout << static_cast< char >( tolower( s[ i ] ) );

cout << endl;
return 0;
} // end main
```
Enter a line of text:
CPPHTP6 Instructor's Manual
The line in uppercase is:
CPPHTP6 INSTRUCTOR'S MANUAL
The line in lowercase is:
cpphtp6 instructor's manual