**Octal to decimal conversion method:**

To convert an octal number to decimal number multiply each digits separately of octal number from right side by 8^0,8^1,8^2,8^3 … respectively and then find out the sum of them.

**Octal to decimal conversion examples:**

For example we want to convert octal number 3401 to decimal number.

Step 1: 1 * 8 ^0 = 1*1 =1

Step 2: 0 * 8 ^1 = 0*8 =0

Step 3: 4 * 8 ^2 = 4*64 =256

Step 4: 3 * 8 ^3 = 3*512 =1536

Sum= 1 + 0 + 256 + 1536 = 1793

So, (3401)

_{8}= (1793)_{10}_{}

**C code to convert octal number to decimal number**

**#include**<stdio.h>

**#include**<math.h>

**int**

**main**(){

**long**

**int**octal,decimal =0;

**int**i=0;

printf("Enter any octal number: ");

scanf("%ld",&octal);

**while**(octal!=0){

decimal = decimal + (octal % 10) * pow(8,i++);

octal = octal/10;

}

printf("Equivalent decimal value: %ld",decimal);

**return**0;

}

**Sample output:**

Enter any octal number: 346

Equivalent decimal value: 230

**C program to change octal to decimal**

**#include**<stdio.h>

**int**

**main**(){

**long**

**int**octalNumber;

printf("Enter any octal number: ");

scanf("%o",&octalNumber);

printf("Equivalent decimal number is: %d",octalNumber);

**return**0;

}

**Sample output:**

Enter any octal number: 17

Equivalent decimal number is: 15

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