In other words, we can say every pointer in programming languages that are not initialized either by the compiler or programmer begins as a wild pointer. The uninitialized pointer’s behavior is undefined because it may point to some arbitrary location that can be the cause of the program crash, that’s the reason it is called a wild pointer. Let’s see the below-mentioned example to understand the declaration of a pointer.Ī pointer that is not initialized properly before its first use is known as the wild pointer. Every pointer has the data types (pre-defined or user-defined) and names followed by an asterisk (*). The Declaration of a pointer is very important because at the time of declaration you define the capability of the pointer. When we have used a pointer to store the address in the memory than using the dereferencing techniques we can also get the value from the address which is stored by the pointer. In other words, we can say, a pointer is used to reference a location in the memory. It will be helpful for others.Ī pointer is similar to a variable but the difference is that pointers store the address of a location in memory and the variable stores the value.
Indirection requires pointer operand in c update#
We will update this pointers questions list and we will give you credit. If you want to update this pointer interview questions list or have any other important questions related to pointers in C/C++, please write in the comment box. I hope these C pointer interview questions with the answer will be helpful. Here I have tried to create a collection of “pointer interview questions with answers in C/C++ ” that might ask by your interviewer. If you are looking for “Pointer Interview Questions in C/C++” or “advanced questions on pointers in C/C++, then you are at the right place. The pointer specifies an address not used by the executing program.This article is mainly focused on the most repeatedly asked and the latest updated Pointer Interview Questions in C that are appearing in most of the C/C++ interviews. The pointer specifies an address that is inappropriately aligned for the type of the object pointed to. The pointer specifies the address of a local item that is not visible at the time of the reference. The following list includes some of the most common conditions that invalidate a pointer value. If the pointer value is invalid, the result is undefined. << "address of n via indirection: " << *ppn << endl << "doubly indirect value: " << **ppn << endl For example: // expre_Indirection_Operator.cpp The indirection operator may be used cumulatively to dereference pointers to pointers. If it points to a storage location, the result is an l-value designating the storage location. If the operand points to a function, the result is a function designator. The use of the * operator in this context is different from its meaning as a binary operator, which is multiplication.
The result of the indirection expression is the type from which the pointer type is derived. The operand of the indirection operator must be a pointer to a type.
The unary indirection operator ( *) dereferences a pointer that is, it converts a pointer value to an l-value.