C++ hexadecimal problem

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lignin

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hello
I am working on arm cortex m3 and I can see 0xFFFFFFu1 in library . So what is the meaning of u ?
thanks for your help
 

without checking..... unsigned long ?
 

thanks . I have one more question.
what is the value of this unsigned value ?
 

by u1 you probably meant ul which stands for unsigned long as mentioned

- - - Updated - - -

1048575 decimal
 

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