Float pointer

All concepts are similar to the integer pointer. If you are directly reading this article, kindly go through the integer pointer topic before getting started with this. Data type is the only difference.

A float pointer only stores an address of a float variable.




Syntax

float *ptr;



Referencing and dereferencing of a float pointer

Example

#include<stdio.h>

int main()
{
    float var = 3.1415,*ptr;

    ptr = &var;   //ptr references var

    printf("Address of var = %x\n",&var);
    printf("ptr is pointing to an address  %x\n",ptr);

    /* use '*' operator to access the value stored at ptr,
       i.e. dereferencing ptr */
    printf("Value stored at ptr = %f",*ptr);

    return 0;
}




Output

For the sake of understanding better, let's assume the address of a variable var.

If we assume address of a variable var as 1024 then the output of the above program will be,


Address of var = 1024
ptr is pointing to an address  1024
Value stored at ptr = 3.141500



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double(data type) pointer

A double(data type) pointer only stores an address of a double variable.




Syntax

double *ptr;



Referencing and dereferencing of a double(data type) pointer

Example

#include<stdio.h>

int main()
{
    double var = 367.141557,*ptr;

    ptr = &var;   //ptr references var

    printf("Address of var = %x\n",&var);
    printf("ptr is pointing to an address  %x\n",ptr);

    /* use '*' operator to access the value stored at ptr,
       i.e. dereferencing ptr */
    printf("Value stored at ptr = %lf",*ptr);

    return 0;
}




Output

If we assume address of a variable var as 2048 then the output of the above program will be,

Address of var = 2048
ptr is pointing to an address  2048
Value stored at ptr = 367.141557

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