How to initialize a C language second-level pointer?

9 months ago

Emily Johnson

1 minute

In C language, a double pointer refers to a pointer that points to another pointer, which means a pointer to a pointer. Here is how you can initialize a double pointer in C.

int num = 10;  // Define an integer variable
int *ptr = &num;  // Define a pointer to an integer variable and point it to the address of the num variable
int **pptr = &ptr;  //Define a pointer to pointer and point it to the address of the ptr pointer

This initializes the second-level pointer. The variable pptr points to the address of pointer ptr, which in turn points to the address of variable num.