AP Computer Science A : Common Data Structures
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Example Questions
Example Question #2 : Arrays
Which of these instantiate a matrix called matrx with 5 columns and 4 rows that takes in integers?
Possible Answers:
int [] [] matrx = new int [] [4];
int [] [] matrx = new int [5] [4];
int [] [] matrx = new int [5] [];
int [] [] matrx = new int [] [5];
int [] [] matrx = new int [4] [5];
Correct answer:
int [] [] matrx = new int [] [4];
Explanation:
You create a matrix also known as a 2 dimensional array the same way you'd instantiate a normal array except the first array space remains blank and you'd insert the number for the amount of rows. Due to the fact that you want 5 columns and 4 rows, you'd only input the 4 into the second array.
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