Write a C program to input decimal number from user and convert decimal to octal number system. How to convert from decimal number system to octal number system in C programming. Logic to convert decimal to octal number system in C program.

**Example**

**Input**

Input decimal: 22

**Output**

Octal number: 26

## Required knowledge

## Decimal number system

Decimal number system is a base 10 number system. Decimal number system uses 10 symbols to represent all numbers i.e. 0123456789.

## Octal number system

Octal number system is a base 8 number system. Octal number system uses 8 symbols to represent all numbers i.e. 01234567

## Algorithm to convert decimal to octal

Algorithm Decimal to Octal conversionbegin:read(decimal);octal← 0;place← 1;rem← 0;While(decimal> 0) dobegin:rem←decimal% 8;octal← (rem*place) +octal;place←place* 10;decimal←decimal/ 8;end;print('Octal number'octal);end;

## Program to convert decimal to octal

/** * C program to convert from Decimal to Octal number system */ #include <stdio.h> int main() { long long decimal, tempDecimal, octal; int i, rem, place = 1; octal = 0; /* * Input decimal number from user */ printf("Enter any decimal number: "); scanf("%lld", &decimal); tempDecimal = decimal; /* * Decimal to octal conversion */ while(tempDecimal > 0) { rem = tempDecimal % 8; octal = (rem * place) + octal; tempDecimal /= 8; place *= 10; } printf("\nDecimal number = %lld\n", decimal); printf("Octal number = %lld", octal); return 0; }

Enter any decimal number: 20 Decimal number = 20 Octal number = 24

Happy coding ;)

### Recommended posts

- Loop programming exercises and solutions in C.
- C program to convert Decimal to Binary number system.
- C program to convert Decimal to Hexadecimal number system.
- C program to convert Octal to Binary number system.
- C program to convert Octal to Decimal number system.
- C program to convert Octal to Hexadecimal number system.
- C program to convert Hexadecimal to Octal number system.

< pre>< code >----Your Source Code---- < / code > < / pre > (Remove spaces from pre and code tags)