Swapping values using pointers in C Programming Language
In this short video I explain how we can use pointers to swap non-local variables.
Additional information about pointers in C:
Pointers also allow us to access and modify variables in the Stack, HEAP, and Data Segment of the Memory. We can only read from the Code Segment of the Memory, therefore we can declare pointers that point to the Code Segment but not change the values.
Declaring and initializing a pointer to an integer:
int *p = &x; ( read as "p (pointer) points to an integer x, p holds the address of the integer x)
or
int *p;
p = &x;
Modifying the value that p points to using only the pointer:
*p = 4; ( dereference p (follow where p points to and change that variable to 4), now x is going to be equal to 4)
Checking the value that p points to:
printf("%d \n", *p);
Useful tip:
Understand the problem by drawing a diagram and solving the problem on paper, before starting to write the code. (It will save you a headache :D)
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