In this tutorial, we will write a C program to convert decimal to binary. Before that, you must have knowledge of the following topics in C.
Binary number
The binary numbers are based on 0 and 1, so it is a base 2 number. They are the combination of 0 and 1. For example, 1001, 110101, etc.
Decimal Number
These are the numbers with a base of 10, which ranges from 0 to 9. These numbers are formed by the combination of 0 to 9 digits such as 24, 345, etc.
Here is the chart where for the equivalent value of decimal and binary numbers.
Example:
Input: 5
Output: 101
Input: 15
Output: 1111
Now let us go through a program for the conversion of decimal to binary in C using while loop.
C Program to Convert Decimal to Binary using While loop
#include <stdio.h>
#include <conio.h>
int main()
{
int deciNum, binaryNum[30], i = 0;
printf("Enter a decimal number: ");
scanf("%d", &deciNum);
while (deciNum != 0)
{
binaryNum[i] = deciNum % 2;
i++;
deciNum = deciNum / 2;
}
printf("Equivalent Binary Value: ");
for (i = (i - 1); i >= 0; i--)
printf("%d", binaryNum[i]);
getch();
return 0;
}Output:
Enter a decimal number: 13
Equivalent Binary Number: 1101
C Program to Convert Decimal to Binary without using Array
Source code: Decimal to Binary without using Array in C.
#include <stdio.h>
#include <conio.h>
int main()
{
int deciNum, binaryNum = 0, mul = 1, rem;
printf("Enter any decimal number: ");
scanf("%d", &deciNum);
while (deciNum > 0)
{
rem = deciNum % 2;
binaryNum = binaryNum + (rem *mul);
mul = mul * 10;
deciNum = deciNum / 2;
}
printf("Equivalent Binary Value: %d", binaryNum);
getch();
return 0;
}After the successful execution of the above program, it will produce the same output as the above program.
