Explain references and pointers in C language?

Question

Explain the concepts of references and pointers in C programming language using examples.

Quote

• It is an alternative name for the variable we declared.

• can be accessed by value.

• It cannot hold null values.

Syntax

datatype *variablename

For example, int *a; //a contains the address of an int type variable.

Pointer

• #It stores the address of the variable.

• We can use pointers to save null values.

• It can be accessed by passing by reference.

• No initialization is required when declaring variables.

Grammar

pointer variable= & another variable;

Example

Example demonstration

#include<stdio.h>
int main(){
   int a=2,b=4;
   int *p;
   printf("add of a=%d</p><p>",&a);
   printf("add of b=%d</p><p>",&b);
   p=&a; // p points to variable a
   printf("a value is =%d</p><p>",a); // prints a value
   printf("*p value is =%d</p><p>",*p); //prints a value
   printf("p value is =%d</p><p>",p); //prints the address of a
   p=&b; //p points to variable b
   printf("b value is =%d</p><p>",b); // prints b value
   printf("*p value is =%d</p><p>",*p); //prints b value
   printf("p value is =%d</p><p>",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

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