C Program to convert Decimal to Binary

Decimal to binary in C: We can convert any decimal number (base-10 (0 to 9)) into binary number(base-2 (0 or 1)) by c program.

Decimal Number

Decimal number is a base 10 number because it ranges from 0 to 9, there are total 10 digits between 0 to 9. Any combination of digits is decimal number such as 23, 445, 132, 0, 2 etc.

Binary Number

Binary number is a base 2 number because it is either 0 or 1. Any combination of 0 and 1 is binary number such as 1001, 101, 11111, 101010 etc.

Let's see the some binary numbers for the decimal number.

Decimal	Binary
1	1
2	10
3	11
4	100
5	101
6	110
7	111
8	1000
9	1001
10	1010

Decimal to Binary Conversion Algorithm

• Step 1: Divide the number by 2 through % (modulus operator) and store the remainder in array
• Step 2: Divide the number by 2 through / (division operator)
• Step 3: Repeat the step 2 until number is greater than 0

Let's see the c example to convert decimal to binary.

1. #include<stdio.h>    
2. #include<stdlib.h>  
3. int main(){  
4. int a[10],n,i;    
5. system ("cls");  
6. printf("Enter the number to convert: ");    
7. scanf("%d",&n);    
8. for(i=0;n>0;i++)    
9. {    
10. a[i]=n%2;    
11. n=n/2;    
12. }    
13. printf("\nBinary of Given Number is=");    
14. for(i=i-1;i>=0;i--)    
15. {    
16. printf("%d",a[i]);    
17. }    
18. return 0;  
19. }  

Output:

Enter the number to convert: 5
Binary of Given Number is=101