p++ is a unary operator that is why it is fast as it operates on only one operand on the other hand p+1 + is a binary operator that is why it is slower as compared to ++
static memory allocation : the memory allocation is done at the time of compilation itself.. it is known as static because this allocation cannot be changed is less memory or more memory is needed at the time of execution of program... in this type good memory management is not achieved as many times memory loss takes place or shortage of memory rakes place.... dynamic memory allocation: the memory allocation is done at the run time of program... as per needed... thus good memory management is achieved this is done by using some inbuilt functions malloc(),calloc(),realloc(),free() etc for using these functions we need to include alloc.h........
This has to do with the processor, memory read cycles, and processor instructions.
All processors have separate increment/decrement instructions for increment/decrement operations. Consequently, when increment/decrement operation has to be carried out only one operand needs to be accessed and that requires 1 memory read cycle and then it goes into the CPU register and then it's incremented/decremented. But for addition operation we require two memory read cycles (because two operands are involved) and then the addition/subtraction operation is applied. This is why increment/decrement is faster than addition/subtraction.
