#include <stdio.h> int main() { int x = 10, *y, **z; y = &x; z = &y; printf(""%d %d %d"", *y, **z, *(*z)); return 0; }

The given C code demonstrates the use of pointers in C programming. Here is a step-by-step explanation of the code:

  1. #include <stdio.h>: This line includes the standard input/output library, which provides functions like printf and scanf.

  2. int main() { ... }: This is the starting point of the program, where the main function is defined. It returns an integer value.

  3. int x = 10, y, *z;: This line declares three variables: x, y, and z. x is an integer variable initialized with the value 10. y is a pointer to an integer, and z is a pointer to a pointer to an integer.

  4. y = &x;: This line assigns the address of x to the pointer y. It means that y now points to the memory location where the value of x is stored.

  5. z = &y;: This line assigns the address of y to the pointer z. It means that z now points to the memory location where the value of y is stored.

  6. printf("%d %d %d", y, z, (z));: This line prints the values of y, z, and (z) using the printf function.

  7. y dereferences the pointer y and retrieves the value stored at the memory location it points to, which is the value of x. So, y will be equal to 10.

  8. z dereferences the pointer z twice and retrieves the value stored at the memory location it points to, which is the value of y. Since y points to x, z will also be equal to 10.

  9. (z) dereferences the pointer z once, which gives the value of y. Then, it dereferences the pointer y and retrieves the value stored at the memory location it points to, which is the value of x. So, (z) will also be equal to 10.

  10. return 0;: This line indicates the end of the main function and returns the value 0, indicating successful program execution.

Note: The printf function uses the format specifier %d to print integer values. The three %d placeholders in the format string correspond to the three variables being printed.

This code snippet demonstrates how pointers can be used to access and manipulate the values stored in memory locations in C.