Pointer Assignment In C

Pointer Assignment In C-43
Pointers are very useful for another type of parameter passing, usually referred to as Pass By Address.

Pointers are very useful for another type of parameter passing, usually referred to as Pass By Address.

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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 “.

If you were to uncomment the last few lines and try to compile that code it would give “assignment from incompatible pointer type” errors and wouldn’t compile.

You can only assign addresses to pointers of the same type.

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.

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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