This C Tutorial Explains Pointer to Pointer or Double Pointer in C Programming with Examples. What is a Double Pointer in C? Basically, a pointer holds address; address of some variable, pointer variable, function, structure, array etc. When pointer holds address of some other pointer variable it’s called pointer-to-pointer or double pointer. Syntax for a … Read more
This C Tutorial Explains Pointer Arithmetic in C Programming with examples. In the C programming language, there are only a few operations that can be performed on Pointers. Different Pointer Operations in C: Increment and Decrement of a Pointer Addition and Subtraction of a Pointer Subtraction of Two Pointers Relational Operations on Pointers Comparison of … Read more
Question: Which Pointer Expressions in C Programming are called as L-Values? Answer: We already know that lvalue refers to some location or storage used by some data object, for example: variables, arrays, structures, pointers etc. Further, ‘l’ in lvalue stands for left side of assignment “=” operator meaning that left side of assignment must be … Read more
This C Tutorial Explains Indirection of a NULL Pointer in C Programming and Describes Pros and Cons of Null Pointer, with examples. As we know that a NULL pointer is one that points to nowhere in memory. For example: int *ip = 0; /* ‘ip’ is a pointer-to-int initialized with value zero */ In the … Read more
This C Tutorial Explains NULL Pointer in C Programming with Examples. What is NULL Pointer in C? A NULL Pointer in C is a special type of pointer which points to nowhere i.e. not anywhere. Pointers declared in the program but not initialized contain garbage addresses, pointing to locations beyond the storage allocated to program … Read more
Question: Can we use address of Operator (&) to Determine Address of a Register Variable in C Answer: addressof operator ‘&’ is a unary operator fetches us address of its operand/data object occupied in memory. But registers are not the part of memory. Instead, these are components of CPU. Further, there are only a few … Read more
Question: What is the Difference Between Pointer to Constant and Regular Pointer in C Language Answer: O key! First, we try to understand what a regular pointer is, how is this declared, initialized and used in a C program? Consider a program, for example: /* * diff_regptr_and_ptr2const1.c — Program shows what happens when regular * … Read more
Question: What is the Difference Between Various Pointers, const type * pname, type * const pname, and const type * const pname in C Answer: We are already familiar with symbolic constants created using ‘const’ keyword. For example: /* sym_const.c — Program creates and accesses symbolic constant */ #include <stdio.h> int main(void) { const … Read more
This C Tutorial Explains the Concept of Pointer Compatibility in C Programming with Examples. The rules for assigning one pointer to another are tighter than the rules for numeric types. For example, you can assign an int value to a double variable without using a type conversion, but you can’t do the same for pointers … Read more
This C Tutorial explains Pointer Constants in C and Define their Purposes with Examples. Every location, specifically every byte, in memory has an address. This address itself is a constant, so is a pointer constant. Remember that left side of assignment operator ‘=’ must be a Modifiable LValue meaning that expression on the left side … Read more
