Source code
import java.math.BigDecimal;
public class CatalanConstant {
public static void main(String[] args) {
BigDecimal sum = new BigDecimal(0);
BigDecimal term;
int sign;
for (int k = 0; k < 1000; k++) {
sign = (k % 2 == 0) ? 1 : -1;
term = BigDecimal.ONE.divide(new BigDecimal(2*k + 1).pow(2), 1000, BigDecimal.ROUND_HALF_UP);
term = term.multiply(new BigDecimal(sign));
sum = sum.add(term);
}
sum = sum.multiply(new BigDecimal(4));
System.out.println(sum);
}
}
Run 1
The code is logically structured and generally easy to follow. The main loop computes terms of an alternating series for Catalan's constant, with clear variable names and a reasonable separation of concerns. However, readability is hurt by several issues: the loop body performs multiple operations (sign computation, term calculation, sign application, accumulation) in a dense block; the mathematical formula is not explained; and the magic numbers (1000, 2, 4) lack context. Nesting is flat, which is good, but the code's intent—computing Catalan's constant via series—is not immediately obvious without domain knowledge. The mathematical expression on one line makes the action granularity slightly poor. Overall, it's competent but could benefit from comments, constants, and clearer separation of computation vs aggregation.
Run 2
The code is reasonably readable: it has a clear single-purpose main method, adequate variable names, and straightforward logic. The loop structure is flat and easy to follow. However, it lacks comments or a constant for the number of iterations, and the mathematical intent (computing Catalan's constant via a series) is not explained. Magic numbers like 1000 (both loop limit and scale) appear without context. Multiple operations are packed into the term assignment lines, reducing clarity slightly. Formatting is consistent but the logic could be more modular or documented.
Run 3
The code has a clear purpose: computing Catalan's constant via series approximation. It uses meaningful variable names and follows a straightforward loop structure. However, several issues reduce readability. The absence of a method to compute the constant and the use of magic numbers (1000 for loop limit and scale) make the intent less clear. The logic of alternating sign and term computation is compressed into multiple operations on a single line, reducing action granularity. The loop body mixes sign calculation, term calculation, and accumulation, which hurts reading flow. The code is relatively concise, but it lacks explanatory comments or a clear separation of concerns. The nesting is flat, which is positive, but clarity is diminished by the inline arithmetic and hard-coded literals. Overall, it is understandable but would benefit from better structure, such as a dedicated method, named constants, and comments explaining the formula.
Run 1
Code Structure: A straightforward main method logically groups initialization, iteration, and output. Nesting: Only one loop, keeping nesting shallow. Clarity of intent: Variable names and the class name suggest a Catalan constant calculation, but unexplained values (1000 and 4) obscure intent; multiplying the series by 4 also conflicts with the named constant. Code length: Compact without substantial unnecessary code. Action granularity: Each statement performs a clear step, although the divide expression combines several operations and is relatively long. Reading flow: Execution proceeds naturally from setup through accumulation to printing. Consistent operator spacing, named constants, and a brief formula comment would improve readability.
Run 2
Code Structure: A straightforward main method organizes initialization, summation, and output logically. Nesting: Only one loop, making control flow easy to follow. Clarity of intent: Names such as sum, term, and sign explain their roles, but unexplained constants (1000 and 4) obscure numerical choices. Multiplying the series by 4 also conflicts with the class name, since the series itself represents Catalan's constant. Code length: Compact without substantial redundancy, although declaring term and sign inside the loop would improve locality. Action granularity: Each statement performs one principal action; the division expression combines several operations but remains understandable. Reading flow: Execution proceeds naturally from setup through calculation to printing. Inconsistent operator spacing and the long division line slightly reduce readability.
Run 3
Code Structure: The calculation is logically organized within a short main method. Nesting: A single loop keeps nesting shallow. Clarity of intent: The class name and sum, term, and sign variables communicate the intended series calculation, but the unexplained iteration count, precision, and final multiplication by 4 obscure the exact purpose; that multiplication also conflicts with computing Catalan's constant directly. Code length: Concise, without unnecessary scaffolding. Action granularity: Most lines perform one action, although the denominator construction, exponentiation, and division share a dense expression. Reading flow: Initialization, term generation, accumulation, and output follow a natural sequence. Consistent spacing around arithmetic operators, named constants, and a brief formula comment would improve readability.