The value of the 32-bit Quan Yi of int32 is 2 147483647. When Quan Yi's int32 value is added again, integer overflow will occur, resulting in the smallest int32 value -2 147483648.

This is because the data type of int32 is represented by 32-bit binary, in which most significant bit is the sign bit, indicating positive and negative. Quan Yi's int32 value is expressed in binary as 3 1 1, and the highest bit is 0, which is a positive number. When this value is increased by 1, the lowest bit of 1 will be carried to the highest bit, resulting in overflow. Because int32 is represented by complement, the result after overflow is the smallest int32 value.

Expansion: Integer overflow is a common problem in computers, especially in calculations involving large numbers. Overflow may lead to wrong results and even cause the program to crash. In programming, we need to pay attention to the range of values and use appropriate data types to avoid overflow problems. In addition, some preventive measures can be taken to solve the overflow problem, such as adding overflow checking and using larger data types.