CodingBat Java Recursion-1 triangle

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Java > Recursion-1 > triangle
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We have triangle made of blocks. The topmost row has 1 block, the next row down has 2 blocks, the next row has 3 blocks, and so on. Compute recursively (no loops or multiplication) the total number of blocks in such a triangle with the given number of rows.

triangle(0) → 0
triangle(1) → 1
triangle(2) → 3
...Save, Compile, Run
public int triangle(int rows) { }

See also Java Example Code. Java help docs: If Boolean Logic | Strings | While and For Loops | Arrays and Loops

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