字符串int值求和程序输出异常：结果莫名混入数字6，求排查建议

Hey there! Let's figure out why that random 6 is sneaking into your sum results. Here are some practical spots to investigate:

• Check for hidden or overlooked digits in your input strings
  It’s easy to miss a stray "6" tucked away in the string—maybe in a whitespace gap, at the start/end, or mixed in with non-digit characters. Try printing the raw input string directly (without any processing) to spot any unexpected 6 you didn’t notice. You can also loop through each character and print both the character and its ASCII value to catch invisible or misinterpreted characters that might be converting to 6.

• Audit your number extraction logic
  If your code parses digits from the string, a bug here could incorrectly generate a 6. For example:

  • Are you properly handling non-digit characters? If you use char - '0' to convert characters to integers, a non-digit character might accidentally result in 6 (double-check edge cases like unclosed quotes or special symbols).
  • Is your digit-tracking state reset correctly? If you don’t reset when a number ends, you might accidentally append a stray character to a valid number, creating something like "26" instead of "2".
  • Verify your string splitting logic—if your delimiter or regex is off, you might capture a substring that includes an unintended 6.

• Check your sum variable initialization
  Is your sum variable reset to 0 before processing each new string? If you reuse the same variable across calculations without resetting it, a leftover value (like 6 from a previous run) could get added to every sum. Also, double-check that there’s no accidental hardcoded line like sum +=6 hiding in your code.

• Test with hardcoded input
  To rule out input source issues (like file reading glitches, copy-paste errors, or user input typos), hardcode the exact strings you expect to return 23 and 29. For example (adjust to your language):

  String testStr1 = "10 13";
  String testStr2 = "15 14";
  System.out.println(calculateSum(testStr1)); // Should output 23
  System.out.println(calculateSum(testStr2)); // Should output 29
  

  If this test works, the problem lies in how you’re receiving your input, not your sum logic.

• Add debug logs to trace the sum step-by-step
  Insert print statements (or use a debugger) to track every step:

  • Print each digit/number you extract from the string.
  • Print the sum after each addition.
    This will show you exactly when the 6 is being added—whether it’s a standalone digit, part of a larger number, or an unexpected extra addition.

内容的提问来源于stack exchange，提问作者hotrod28