int a = 5； //Define an integer variable A and assign a value of 5 to the variable A..

p = & ampa； //Point the pointing variable p to the address a (&; Is an address operator)

printf("%d "，* p)； //Print what the pointer p points to. Please note that the meaning of "*" here is different from the meaning of "*" used in the definition in the first line. The "*" here refers to what the pointer variable p points to, while the "*" used in the first line definition means that the variable p is a pointer type variable.