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Dereferencing can be used to either indirectly get a value from the pointer address or to assign a value to the pointer address. In this example we have used dereferencing to both get and set values.Some people get confused and think dereference means getting a value. Dereference means to indirectly access the address stored in the pointer.In practice it is rare to see more than a pointer to a pointer. Take the following code: I hope this (somewhat) brief overview helps with some of the different types of pointers you will see.
For a compiler, a variable is a symbol for a starting memory address.
The compiler knows two things about any variable, the name and the type. Back when C was created, computers were much slower. Programmers needed to be much more efficient at solving problmes.
Pointers are very useful for another type of parameter passing, usually referred to as Pass By Address.
Pointers are essential for dynamic memory allocation.
The , what actually happens is the compiler allocates memory for the entire array and then assigns a pointer to the array variable, in this case myarray, holding the address of the first element in the array.
Some people get confused and start thinking you can interchange pointers and arrays. You can assign an array variable to a pointer of the same type but not the opposite.A pointer holds a reference to a variable; the reference being the memory address stored in the pointer.When we access the value at that reference, we de-reference the pointer.For 64 bit systems, like most are these days, pointers will be 8-bytes or 64-bits. It is telling the compiler, “I have the address of a variable in the pointer.The // declare an int pointer name ptr int *ptr; // declare an int with the value of 1 int val = 1; // get the address of the val variable and store it in ptr ptr = &val; // dereference the ptr variable to get the int value at the address stored int deref = *ptr; // dereference the ptr variable to set the int value at the address stored *ptr = 2; operator to get the address-of a variable of the correct type. I want to access that pointed-to address either to get a value or set a value “.If you are reading this you want to know more about c pointers. Even if you don’t program in C very often, understanding pointers gives you a deeper understanding how programming and memory works “under the hood”. Then we will finish up with different types of pointers you will encounter. That’s true but it’s also just scratching the surface.Learning pointers will make you a better programmer. When a variable gets declared, memory to hold a variable of that type is allocated at an unused memory location. *pc is the value pointed at the pc address whereas, // &c is an address. *pc is a value stored at the pc address and, // c is also a value (not address).There are two main operators for working with pointers.The operator is used when declaring a pointer and when dereferencing a pointer.