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Example of how to convert a decimal number into a binary number. The result of the function will be stored and returned in form of a char array (char*). This function will only convert a single character (byte) into its binary representation.

char* decimal_to_binary(int input)
{
    static char buf[9];
    buf[8] = '\0';
    int i = -1;
    int j = -1;

    for (j=128,i=0; j>0; j>>=1,i++)
    {
        buf[i] = ( ((input & j) == j) ? 49 : 48);
    }

    return buf;
}

Here’s a full example which demonstrates how to implement this method:

#include <stdio.h>

char* decimal_to_binary(int input)
{
    static char buf[9];
    buf[0] = '\0';
    int i = -1;
    int j = -1;

    for (j=128,i=0; j>0; j>>=1,i++)
    {
        buf[i] = ( ((input & j) == j) ? 49 : 48);
    }

    return buf;
}

int main(void)
{
  printf("08d : %s \n", decimal_to_binary(255));
  printf("16d : %s \n", decimal_to_binary(16));
}