C Program to Access Address of Variable using Pointer

Program :

<span style='color:#004a43'>#</span><span style='color:#004a43'>include</span><span style='color:#800000'><</span><span style='color:#40015a'>stdio.h</span><span style='color:#800000'>></span>
<span style='color:#800000;font-weight:bold'>void</span> <span style='color:#400000'>main</span><span style='color:#808030'>(</span> <span style='color:#808030'>)</span>
<span style='color:#800080'>{</span>
<span style='color:#800000;font-weight:bold'>int</span> i <span style='color:#808030'>=</span> <span style='color:#008c00'>3</span> <span style='color:#800080'>;</span>
<span style='color:#603000'>printf</span><span style='color:#808030'>(</span><span style='color:#800000'>"</span><span style='color:#0f69ff'>n</span><span style='color:#0000e6'>Address of i = </span><span style='color:#0f69ff'>%u</span><span style='color:#800000'>"</span><span style='color:#808030'>,</span> <span style='color:#808030'>&</span>i <span style='color:#808030'>)</span> <span style='color:#800080'>;</span>
<span style='color:#603000'>printf</span><span style='color:#808030'>(</span><span style='color:#800000'>"</span><span style='color:#0f69ff'>n</span><span style='color:#0000e6'>Value of i = </span><span style='color:#0f69ff'>%d</span><span style='color:#800000'>"</span><span style='color:#808030'>,</span> i <span style='color:#808030'>)</span> <span style='color:#800080'>;</span>
<span style='color:#603000'>printf</span><span style='color:#808030'>(</span><span style='color:#800000'>"</span><span style='color:#0f69ff'>n</span><span style='color:#0000e6'>Value of i = </span><span style='color:#0f69ff'>%d</span><span style='color:#800000'>"</span><span style='color:#808030'>,</span> <span style='color:#808030'>*</span><span style='color:#808030'>(</span> <span style='color:#808030'>&</span>i <span style='color:#808030'>)</span> <span style='color:#808030'>)</span> <span style='color:#800080'>;</span>
<span style='color:#800080'>}</span>

#include<stdio.h>

void main( )

{

int i = 3 ;

printf("nAddress of i = %u", &i ) ;

printf("nValue of i = %d", i ) ;

printf("nValue of i = %d", *( &i ) ) ;

}

Output:

Address of i = 65524
Value of i = 3
Value of i = 3

Address of i = 65524

Value of i = 3

Explanation :

Variable ‘i’ is declared of type integer in the program , now suppose the integer variable can have value 3 stored inside it and it has address 65524.

Suppose we want to access the address of the variable i then we can use ampersand operator to find the address of the variable.

<span style='color:#308080'>&</span>i

1	<span style='color:#308080'>&</span>i

and whenever we use ampersand and value at operator together then we will get actual value of the variable.

<span style='color:#308080'>*</span> <span style='color:#308080'>(</span><span style='color:#308080'>&</span>i<span style='color:#308080'>)</span> <span style='color:#308080'>=</span> Value at <span style='color:#308080'>(</span><span style='color:#308080'>&</span>i<span style='color:#308080'>)</span>
       <span style='color:#308080'>=</span> Value at <span style='color:#308080'>(</span><span style='color:#008c00'>65535</span><span style='color:#308080'>)</span>
       <span style='color:#308080'>=</span> <span style='color:#008c00'>3</span>

* (&i) = Value at (&i)

= Value at (65535)

= 3

Values of Variable and Address

Variable Expression

Meaning of the Variable

Value

<span style='color:#308080'>&</span>i

1	<span style='color:#308080'>&</span>i

Address of i

65524

Value of variable i

<span style='color:#308080'>*</span><span style='color:#308080'>(</span> <span style='color:#308080'>&</span>i <span style='color:#308080'>)</span>

1	<span style='color:#308080'>*</span><span style='color:#308080'>(</span> <span style='color:#308080'>&</span>i <span style='color:#308080'>)</span>

Value of variable i

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