CodeWorkout

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What is wrong with this code?

String x; if (x.length() > 0) System.out.println("Hello "+x);

X1280: Arrays

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What does this code do?

int nums[] = {}; System.out.println(nums.length);

X1321: Select The Best Answer

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Railroad diagrams, also known as syntax diagrams, are a visual way to represent the grammar of a programming language. To use it, you...

X1322: Valid for loop?

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Railroad diagrams, also known as syntax diagrams, are a visual way to represent the grammar of a programming language. To use it, you...

X1323: Valid for loop (3)?

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Railroad diagrams, also known as syntax diagrams, are a visual way to represent the grammar of a programming language. To use it, you...

X1324: Valid for loop (4)?

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Railroad diagrams, also known as syntax diagrams, are a visual way to represent the grammar of a programming language. To use it, you...

X1325: Execute a for loop (1)?

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How many times does the loop execute? That is, how many times is hello() called?

for(;;) hello(); }

X1326: Execute a for loop (2)?

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How many times does the loop execute? That is, how many times is hello() called?

for (int i = 0; i < 5; i++) hello(); }

X1327: Execute a for loop (3)?

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How many times does the loop execute? That is, how many times is hello() called?

for (int i = 0; i <= 5; i++) hello(); }

X1328: Execute a for loop (4)?

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How many times does the code below calls greetings()?

for (int i = 0; i < 10; i++) hello(); greetings(); }

X1398: Root of a binary tree

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What is the root node of the tree shown here?

X1399: Internal nodes in a binary tree

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How many internal nodes there are in the tree shown here?

X1400: Depth of a binary tree

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What is the depth of the tree shown here?

X1401: Child nodes in a binary tree

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Select all of the nodes that are children of node 10 in the binary tree shown here.

X1402: Type of binary tree

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What type of binary tree is this?

X1403: Depth of a binary tree

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What is the depth of the tree shown here?

X1404: Number of nodes at a level in binary tree

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How many nodes are at level 3 in this tree?

X1432: Given this image, select the parenthesized notation

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