In this post we will learn how to write a C Program to Convert Decimal Numbers to Binary Numbers.

Example 2

Convert the decimal number 35 to binary.

Solution

Write out the number at the right corner. Divide the number continuously by 2 and write the quotient and the remainder. The quotients move to the left, and the remainder is recorded under each quotient. Stop when the quotient is zero.

              0  <-  1 <-    2 <-    4 <-    8 <-    17 <-    35   Dec.

Binary            1        0        0         0          1           1  

Convert Decimal to Binary in C

/**
C program to convert decimal number into binary by codebind.com
*/

#include <stdio.h>
#include <conio.h>

/* Function to convert a decimal number to binary number */
long DecimalToBinary(long n) {
  int remainder;
  long binary = 0, i = 1;

  while(n != 0) {
    remainder = n%2;
    n = n/2;
    binary= binary + (remainder*i);
    i = i*10;
  }
  return binary;
}
int main() {
  long decimal;
  printf("Please Enter a decimal number : ");
  scanf("%ld", &decimal);
  printf("Binary number of %ld is %ld\n", decimal, DecimalToBinary(decimal));

  getch();
  return 0;
}

/*
OUTPUT:
Please Enter a decimal number : 7
Binary number of 7 is 111
*/