calc: Set maximum digit length to 9 #35
Merged
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According to #25, we find that the input number is random if the digits of the number is larger than 9 digits.
The type of calc->stack[0] is int, and the maximum value for an int is 2,147,483,647. Conservatively, we ensure that when the length reaches 9 digits, pressing the digit button will not increase the number of digits.