The narrow printed circuit board of a computer is known as the CPU or Central Processing Unit

What is this checking for?

In the array based implementation of the stack is an if statement if (top < MAX_STACK – 1) … // a. a null pointer error b. does the stack have room for a new entry c. is the array empty d. where should we put the new entry

There can be only one _______________ in a Java source-code file, and it must precede all other declarations and statements in the file.

Fill in the blank(s) with the appropriate word(s).