pointer variable

int myAge = 43; // an int variable
int*ptr = &myAge; // pointer variable named ptr, used to store the address of myAge
printf("%d\n", myAge); // print the value of myAge (43)
printf("%p\n", \&myAge); // output the memory address of myAge (0x7ffe5367e044)
printf("%p\n", ptr); // use the pointer (0x7ffe5367e044) to output the memory address of myAge