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Algorithms

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Question 49

A meteorological station records daily rainfall measurements in millimeters over a period of time, stored in an array rainfall.

A programmer writes the following pseudocode to find the maximum increase in rainfall between any two consecutive days.

1 PROCEDURE maxRainfallIncrease()
2 BEGIN PROCEDURE
3     SET max_increase TO 0.0
4     FOR k FROM 0 TO LENGTH(rainfall) - 1 DO
5         SET increase TO rainfall[k + 1] - rainfall[k]
6         IF increase > max_increase THEN
7             SET max_increase TO increase
8         END IF
9     END FOR
10    RETURN max_increase
11 END PROCEDURE

The algorithm compiles successfully, but crashes due to an error on line 5 when it runs.

Name this type of error.

[1]
Markscheme

Algorithms Questions

  1. GCSE
  2. /Computer Science
  3. /Algorithms

159 exam-style questions on Edexcel GCSE Computer Science Algorithms, covering Constructs for solving problems, Variables, constants and data structures, Arithmetic, relational and logical operators, Tracing algorithm output with trace tables, Types of error and correcting logic errors, Standard algorithms (sorts and searches), and Evaluating algorithm fitness and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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