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C Program to Convert Decimal to Octal

Convert Decimal to Binary in C

Last Updated : 18 Jul, 2023

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In this article, we will learn to write a C program to convert a decimal number into a binary number. The decimal number system uses ten digits from 0 to 9 to represent numbers and the binary number system is a base-2 number system that uses only 0 and 1 to represent numbers.

decimal to binary conversion in c

Algorithm to Convert Decimal Numbers to Binary in C

Find the remainder by taking the modulus of the given number with 2.
Store the remainder as a binary digit in an array.
Update the number by dividing it by 2.
Repeat these steps till the number is greater than zero.

C Program to Convert Decimal Numbers to Binary

C

   // C Program to Convert Decimal Numbers to Binary 
  
#include <stdio.h> 
  
// function to convert decimal to binary 
void decToBinary(int n) 
{ 
    // array to store binary number 
    int binaryNum[1000]; 
  
    // counter for binary array 
    int i = 0; 
    while (n > 0) { 
  
        // storing remainder in binary array 
        binaryNum[i] = n % 2; 
        n = n / 2; 
        i++; 
    } 
  
    // printing binary array in reverse order 
    for (int j = i - 1; j >= 0; j--) 
        printf("%d", binaryNum[j]); 
} 
  
// Driver program to test above function 
int main() 
{ 
    int n = 17; 
    decToBinary(n); 
    return 0; 
}
 
  

Output

Complexity Analysis

Time complexity: O(1)
Auxiliary space: O(1)

Please refer complete article on Program for Decimal to Binary Conversion for more details!

C Program to Convert Decimal to Octal

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