A climate scientist writes a computer program to calculate the average daily rainfall over a year. The program executes successfully to the end without any warnings or crashes, but it outputs a negative value for the average rainfall because a subtraction operator was used instead of an addition operator in the summation loop.
State the type of programming error that is present in this program.
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.