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What does expression must be a modifiable lvalue mean? The expression on the left should be something you can assign a value to (the "l" in "lvalue" stands for "left"), and the expression on the right should compute the value you want to assign
C - expression must be a modifiable lvalue - Stack Overflow But the unary operator ++ requires an lvalue as stated: 6 5 3 1 p1 The operand of the prefix increment or decrement operator shall have atomic, qualified, or unqualified real or pointer type, and shall be a modifiable lvalue Therefore you can do: p_Buf = ( uint8_t* )p_Buf + 1 ; Where p_Buf is lvalue and ( uint8_t* )p_Buf is rvalue