Lesson 22: C Programming - How to change the value of an integer through pointer peeking into memory

int main() is the entry point of a C program, where execution begins. In this line, we are defining the main function of the program, which will return an integer value (in this case, 0).

int a = 10; creates an integer variable named a and initializes it with the value 10. In other words, this line allocates memory to store an integer value and assigns the value of 10 to that memory location.

printf("9: a = %d\n", a); is a function that prints formatted text to the console. Here, it prints the string "9: a = " followed by the value of a. The %d in the format string specifies that an integer should be printed in its place.

printf("11: memory location a = %p\n", &a); prints the memory location of variable a. The %p format specifier is used to print a memory address in hexadecimal format. The &a operator retrieves the address of the variable a in memory.

printf("14: value of a = %d\n", *(&a)); retrieves the value stored in the memory location of a using the * operator. In this case, &a returns the address of the variable a, and *(&a) returns the value stored at that address. The value of a is printed using %d format specifier.

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