Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Explain reference and pointer in C programming?
Problem
Explain the concept of reference and pointer in a c programming language using examples.
Reference
It is the alternate name for the variable that we declared.
It can be accessed by using pass by value.
It cannot hold the null values.
Syntax
datatype *variablename
For example, int *a; //a contains the address of int type variable.
Pointer
It stores the address of variable.
We can hold the null values using pointer.
It can be access by using pass by reference.
No need of initialization while declaring the variable.
Syntax
pointer variable= & another variable;
Example
#include<stdio.h>
int main(){
int a=2,b=4;
int *p;
printf("add of a=%d
",&a);
printf("add of b=%d
",&b);
p=&a; // p points to variable a
printf("a value is =%d
",a); // prints a value
printf("*p value is =%d
",*p); //prints a value
printf("p value is =%d
",p); //prints the address of a
p=&b; //p points to variable b
printf("b value is =%d
",b); // prints b value
printf("*p value is =%d
",*p); //prints b value
printf("p value is =%d
",p); //prints add of b
}Output
add of a=-748899512 add of b=-748899508 a value is =2 *p value is =2 p value is =-748899512 b value is =4 *p value is =4 p value is =-748899508
Updated on: 09-Mar-2021
655 Views
Advertisements