# C code for decimal to octal converter

Levels of difficulty: / perform operation:

Octal number system: It is base 8 number system which uses the digits from 0 to 7.

Decimal number system:
It is base 10 number system which uses the digits from 0 to 9

Decimal to octal conversion method:
``` Step 1: Divide the original decimal number by 8 Step 2: Divide the quotient by 8 Step3: Repeat the step 2 until we get quotient equal to zero. ```
Result octal number would be remainders of each step in the reverse order.

Decimal to octal conversion with example:

For example we want to convert decimal number 525 in the octal.

Step 1: 525 / 8 Remainder : 5 , Quotient : 65
Step 2: 65 / 8 Remainder : 1 , Quotient : 8
Step 3: 8 / 8 Remainder : 0 , Quotient : 1
Step 4: 1 / 8 Remainder : 1 , Quotient : 0

So equivalent octal number is: 1015
That is (525)10 = (1015)8

### C Program 1

```#include<stdio.h>
int main() {
long int decimalNumber,remainder,quotient;
int octalNumber,i=1,j;
printf("Enter any decimal number: ");
scanf("%ld",&decimalNumber);
quotient = decimalNumber;
while(quotient!=0) {
octalNumber[i++]= quotient % 8;
quotient = quotient / 8;
}
printf("Equivalent octal value of decimal number %d: ",decimalNumber);
for (j = i -1 ;j> 0;j--)
printf("%d",octalNumber[j]);
return 0;
}
```

### Output 1

```Enter any decimal number: 50
Equivalent octal value of decimal number 50: 62
```

### C Program 2

```#include<stdio.h>
int main() {
long int decimalNumber;
printf("Enter any decimal number : ");
scanf("%d",&decimalNumber);
printf("Equivalent octal number is: %o",decimalNumber);
return 0;
}
```

### Output 2

```Enter any decimal number: 25
Equivalent octal number is: 31
```

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