for input string: Why does it appear?

for input string: What is the reason?

"for input string:" error detailed error The information is "java.lang.NumberFormatException: For input string:" exception;

This exception is due to a formatting exception thrown when converting a string that does not conform to the number format into a number;

Solution:

1. If there is an exception during debugging, use debug or print statements to output the variables and correct the string to numeric format;

2. If there is an exception during runtime, please use try catch statement capture;

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