C言語におけるダブルポインタ（ポインタツーポインタ）

Begin
   Declare v of the integer datatype.
      Initialize v = 76.
   Declare a pointer p1 of the integer datatype.
   Declare another double pointer p2 of the integer datatype.
   Initialize p1 as the pointer to variable v.
   Initialize p2 as the pointer to variable p1.
   Print “Value of v”.
      Print the value of variable v.
   Print “Value of v using single pointer”.
      Print the value of pointer p1.
   Print “Value of v using double pointer”.
      Print the value of double pointer p2.
End.

int main() {
   int v = 76;
   int *p1;
   int **p2;
   p1 = &v;
   p2 = &p1;
   printf("Value of v = %d\n", v);
   printf("Value of v using single pointer = %d\n", *p1 );
   printf("Value of v using double pointer = %d\n", **p2);
   return 0;
}

Value of v = 76
Value of v using single pointer = 76
Value of v using double pointer = 76