A Program to Convert Decimal to Binary

In this example, we are giving a program to convert a number from decimal to binary.


Program to convert decimal to binary:

  1. #include <math.h>
  2. #include <stdio.h>
  3. long long convert(int n);
  4. int main() {
  5. int n;
  6. printf("Enter a decimal number: ");
  7. scanf("%d", &n);
  8. printf("%d in decimal = %lld in binary", n, convert(n));
  9. return 0;
  10. }
  11. long long convert(int n) {
  12. long long bin = 0;
  13. int rem, i = 1, step = 1;
  14. while (n != 0) {
  15. rem = n % 2;
  16. printf("Step %d: %d/2, Remainder = %d, Quotient = %d\n", step++, n, rem, n / 2);
  17. n /= 2;
  18. bin += rem * i;
  19. i *= 10;
  20. }
  21. return bin;
  22. }

Output:

Enter a decimal number: 19
Step 1: 19/2, Remainder = 1, Quotient = 9
Step 2: 9/2, Remainder = 1, Quotient = 4
Step 3: 4/2, Remainder = 0, Quotient = 2
Step 4: 2/2, Remainder = 0, Quotient = 1
Step 5: 1/2, Remainder = 1, Quotient = 0
19 in decimal = 10011 in binary