0x7fffffff mean

Today saw a request sent to the back-end, pass a parameter 0x7fffffff, was surprised
then search 0x7fffffff
7FFFFFFF is eight hexadecimal
for each hex on behalf of four bit
8✖4bit 4Byte = 32bit =
f binary is : bits of 1111,7 0111
int type bit 4Byte length
from the left, the first is the sign bit, 0 stands for positive, 1 for negative
0x7fffffff int represents the maximum
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