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Why is the hexadecimal printf output of C language sometimes with 0xff and sometimes not

2022-04-23 19:29:00 【ToneChip】 

	unsigned short aaa = 0xC000;
	printf("0x%x \n", (aaa << 8) );

 Output  0xC00000

 Write another one like this 

	short aaa = 0xC000;
	printf("0x%x \n", (aaa << 8) );

 Output :0xFFC00000

This is because of the following short What is defined is a signed bit 16Bit, After moving left , It is also the corresponding signed int

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