Pointer Assignment In C

Pointer Assignment In C-4
There are two main operators for working with pointers.The operator is used when declaring a pointer and when dereferencing a pointer.

There are two main operators for working with pointers.The operator is used when declaring a pointer and when dereferencing a pointer.Declaring a pointer to be a specific type tells the compiler when the pointer is dereferenced the value pointed to will be of that type.

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A pointer is a variable that stores a memory address.

Pointers are used to store the addresses of other variables or memory items.

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 “.

In this post we will start with variables and memory. The location that is allocated is the variable’s memory address.

Most programmers will say a variable is a name for a piece of data that can change in a program.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.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.Declaring a pointer is like declaring any other variable. The size of a pointer, the number of bytes that are used to store each pointer, is dependent on the architecture of the machine.For 32-bit systems, pointers will be 4-bytes or 32-bits.You can get a value, like we do in line 6 above, or you can set a value, like we do in line 10 above. When we declare a int pointer we are declaring the variable as a pointer, that it holds the address of another variable, and that the value at that address is an int.Same goes for a float pointer, char pointer, or any other type.During that conversion variable names are converted to relative memory addresses. Don’t worry, you don’t need to know assembly to know pointers. C programs have different types of variables including ints, floats, arrays, chars, structs, and pointers. You don’t want to have to copy the 400,000 bytes into a function. Instead you have a pointer which references the array.An int holds an integer number, a float holds a floating point decimal number. A pointer is a variable that holds the memory address of another variable. The pointer, all 4 or 8 bytes of it, is copied into the function where it can be dereferenced and the array accessed. Don’t pass a copy of the large struct in, pass in a pointer to the struct.

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