Delphi Programming Quiz

Which property of a TStringGrid in Delphi determines the number of rows displayed?

• RowCount

• ColCount

• FixedRows

• FixedCols

Answer explanation

The RowCount property of a TStringGrid in Delphi specifies the total number of rows that can be displayed. It directly controls how many rows are visible in the grid, making it the correct choice for this question.

What is the purpose of initialising a two-dimensional array in Delphi?

• To set the values of some elements to specific values.

• To allocate memory for the array.

• To set the values of all elements to zero.

• To create a copy of an existing array.

Answer explanation

The primary purpose of initializing a two-dimensional array in Delphi is to allocate memory for the array. This step is essential before any values can be assigned or manipulated within the array.

What is the primary advantage of using a two-dimensional array in Delphi programming?

• Fixed ability

• Complexity

• Ease of use

• Flexibility

Answer explanation

The primary advantage of using a two-dimensional array in Delphi is its ease of use. It allows for straightforward organization and access to data in a tabular format, making it simpler to manage and manipulate compared to more complex structures.

True or False. A StringGrid should only be used as output and not for processing or storing data.

Answer explanation

False. A StringGrid can be used for both displaying and processing data, as it allows for data manipulation and storage in a tabular format, making it versatile for various applications.

Match the following variable declarations in Delphi with the appropriate scenario:

Answer explanation

In Delphi, variable declarations must match their intended use. For example, 'Integer' is suitable for counting, while 'String' is for text. Correctly matching these ensures proper data handling and avoids type errors.

True or False: To increase the width of a StringGrid, the ColNumber property must be increased.

Answer explanation

False. The width of a StringGrid is determined by the Width property, not the ColNumber. Increasing ColNumber only adds more columns, not width.

A StringGrid in Delphi can be sorted and filtered based on certain criteria.

Answer explanation

A StringGrid in Delphi allows for sorting and filtering of data, enabling users to organize and view information based on specific criteria, enhancing data management and usability.

True or False: In the coordinates of the cells of a StringGrid, the first coordinate refers to the row number and the second to the column number.

Answer explanation

True. In a StringGrid, the first coordinate indeed refers to the row number, while the second coordinate refers to the column number, following the standard convention for grid coordinates.

What is the starting index of a dynamic array?

• -1

• 0

• 2

• 1

Answer explanation

The starting index of a dynamic array is 0, as arrays in most programming languages are zero-indexed. This means the first element is accessed with index 0, making it the correct choice.

In Delphi, which property is used to control the number of columns in a TStringGrid at runtime?

• RowCount

• ColCount

• FixedCols

• FixedRows

Answer explanation

The ColCount property in TStringGrid is used to set the number of columns at runtime. It directly controls how many columns the grid will display, making it the correct choice for this question.