How does a logic error manifest in a program?

A logic error occurs when a program runs without crashing but does not produce the expected results due to mistakes in the reasoning or logic within the code. For example, if the programmer intended to calculate the average of a set of numbers but inadvertently used the wrong formula, the program will execute (since there's no syntax error) but will yield incorrect outputs. This discrepancy between the intended outcome and the actual results is what characterizes a logic error.

The other manifestations of issues in a program are more clearly defined by their nature. A program failing to start typically results from syntax errors or issues in the execution environment. Halting during execution suggests there may be runtime errors, and syntax issues would prevent the code from compiling or executing correctly in the first place. In contrast, logic errors are unique as they do not disrupt the program's ability to run but rather affect the accuracy of its outcomes.