What data type must be used as an array index?
What will be an ideal response?
The type of value that must be used as an array index is an integer.
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Which set of statements totals the items in each row of two-dimensional array items, and displays each row’s total?
a.``` for (int row = 0; row < items.length; row++) { int total = 0; for (int column = 0; column < items[row].length; column++) { total += items[row][column]; System.out.printf("Row %d's total is %d%n", row, total); } ``` b.``` int total = 0; for (int row = 0; row < items.length; row++) { for (int column = 0; column < items[row].length; column++) { total += items[row][column]; } System.out.printf("Row %d's total is %d%n", row, total); } ``` c.``` int total = 0; for (int row = 0; row < items.length; row++) { for (int column = 0; column < items[column].length; column++) { total += items[row][column]; } System.out.printf("Row %d's total is %d%n", row, total); } ``` d. ``` for (int row = 0; row < items.length; row++) { int total = 0; for (int column = 0; column < items[column].length; column++) { total += items[row][column]; } System.out.printf("Row %d's total is %d%n", row, total); } ```
Which function would be the most useful for determining if a certain word is contained in a string representing a sentence?
a. strcspn. b. strchr. c. strstr. d. strrchr.
Answer the following statements true (T) or false (F)
1. An interface reference may invoke only the methods that the interface declares. 2. To use an interface, a class must define only the methods in the interface that it will need to use. 3. An interface always should be used to specify data and services that will be provided by objects in a hierarchical relationship. 4. A class may implement only one interface. 5. A derived class can add its own instance variables, Shared variables, properties and methods, and it can customize methods and properties it inherits.
?Case 3-2 Application software (apps) includes all the programs that allow you to perform specific tasks or applications on a computer. Individuals and businesses use software to write letters, keep track of finances, participate in videoconferences, watch videos, make business presentations, process orders, access Web-based resources, and many other tasks. In the following questions, identify the tasks of different application software. Michelle wants an application program that can use formulas to perform calculations and organize numbers and values into rows and columns. Identify the application program that Michelle should choose.
A. ?Word processing program B. ?Spreadsheet program C. ?Presentation software D. ?Note taking software