Loop Exercises
Write a C program to input decimal number from user and convert 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 programming.
Required knowledge
Basic C programming, While loop
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 conversion
begin: read(decimal); octal ← 0; place ← 1; rem ← 0; While (decimal > 0) do begin: 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 number system
/** * 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; }
Output
Enter any decimal number: 31
Decimal number = 31
Octal number = 37