Which effect can you set for screen savers?

Which of the following is an illegal use of function put?

a. cout.put( 'A' ); b. cout.put( "A" ); c. cout.put( 'A' ).put( '\n' ); d. cout.put( 65 );

Consider the following statements:  struct rectangleData{  double length;  double width;  double area;  double perimeter;};  rectangleData bigRect;Which of the following statements is valid in C++?

A. cin >> bigRect; B. cin >> bigRect.length; C. perimeter = 2 * (length + width); D. area = length * width;