What is pointer to pointer in C?

C Programming Language > Pointer in C Language > Pointer in C

Long Question

715

Answer:

In case of a pointer to pointer concept, one pointer refers to the address of another pointer. The pointer to pointer is a chain of pointers. Generally, the pointer contains the address of a variable. The pointer to pointer contains the address of a first pointer. Let's understand this concept through an example:


#include <stdio.h>  
 int main()  
{  
    int a=10;  
    int *ptr,**pptr; // *ptr is a pointer and **pptr is a double pointer.  
    ptr=&a;  
    pptr=&ptr;  
    printf("value of a is:%d",a);  
    printf("\n");  
    printf("value of *ptr is : %d",*ptr);  
    printf("\n");  
    printf("value of **pptr is : %d",**pptr);  
    return 0;  
}

Output:

In the above example, pptr is a double pointer pointing to the address of the ptr variable and ptr points to the address of 'a' variable.

Go to Question List

This Particular section is dedicated to Question & Answer only. If you want learn more about C Programming Language. Then you can visit below links to get more depth on this subject.

C Syllabus

C Tutorial

C Chapterwise Programs

C Chapterwise MCQs

C Chapterwise Q & A

C Free Videos

# C Tutorials # JAVA Tutorials # HTML Tutorials # Computer Fundamental # Data Structure # DBMS Tutorials SQL # C# Language # R Language # PHP # Python # Vue JS

Join Our telegram group to ask Questions

Click below button to join our groups.

Ask Question - CSE

Programming Language - PDF

Related Program List

737. What is static memory allocation?

# Tutorial: static Variable in C

Question: Variable in C Language Long

738. What is dynamic memory allocation?

# Tutorial: Introduction to DMA

Question: Dynamic Memory Allocation Long

739. What functions are used for dynamic memory allocation in C language?

# Tutorial: Introduction to DMA

Question: Dynamic Memory Allocation Long

740. What is the difference between malloc() and calloc()?

# Tutorial: calloc() and free()

Question: Dynamic Memory Allocation Long

741. What is the structure?

# Tutorial: Structure in C

Question: Structure in C Language Long

742. What is a union?

# Tutorial: Union in C

Question: Union in C Language Long

743. What is an auto keyword in C?

Answer:

In C, every local variable of a function is known as an automatic (auto) variable. Variables which are declared inside the function block are known as a local variable. The local variables are also known as an auto variable. It is optional to use an auto keyword before the data type of a variable. If no value is stored in the local variable, then it consists of a garbage value.

# Tutorial: static Variable in C

Question: Variable in C Language Short

744. What is the purpose of sprintf() function?

# Tutorial: File Operation in c

Question: File Input/Output Long

745. Can we compile a program without main() function?

Answer:

Yes, we can compile, but it can't be executed.

But, if we use #define, we can compile and run a C program without using the main() function. For example:


#include<stdio.h>    
#define start main    
void start() {    
   printf("Hello");    
}

# Tutorial: Basic Structure of C Programming

Question: Overview of C Language Short

746. What is a token?

# Tutorial: Tokens in C

Question: Overview of C Language Long