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C language uses %X to output hexadecimal numbers of type long long. When this number is negative, how to make its sign bit expansion complete with F?
Your compiler must support 64-bit integers.

In this example, long long is a 64-bit number.

The output can be changed to:

printf("0X%0 16LLX "，b)；

Otherwise, we can only make changes:

if(b & lt； 0)printf("0XFFFFFFFF%8X "，b)；

else printf("0X%0 16X "，b)；

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