decimal to binary using recursion (#575)

* add decimal_to_binary_recursion.c

* updating DIRECTORY.md

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Du Yuanchao 2020-07-31 19:00:02 +08:00 committed by GitHub
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* [Binary To Octal](https://github.com/TheAlgorithms/C/blob/master/conversions/binary_to_octal.c)
* [C Atoi Str To Integer](https://github.com/TheAlgorithms/C/blob/master/conversions/c_atoi_str_to_integer.c)
* [Decimal To Binary](https://github.com/TheAlgorithms/C/blob/master/conversions/decimal_to_binary.c)
* [Decimal To Binary Recursion](https://github.com/TheAlgorithms/C/blob/master/conversions/decimal_to_binary_recursion.c)
* [Decimal To Hexa](https://github.com/TheAlgorithms/C/blob/master/conversions/decimal_to_hexa.c)
* [Decimal To Octal](https://github.com/TheAlgorithms/C/blob/master/conversions/decimal_to_octal.c)
* [Decimal To Octal Recursion](https://github.com/TheAlgorithms/C/blob/master/conversions/decimal_to_octal_recursion.c)

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/**
* @file
* @brief Convert decimal to binary using recursion algorithm
*/
#include <assert.h>
/**
* Decimal to binary using recursion algorithm.
* For example, if number = 5, the function returns the decimal integer 101.
* @param number positive integer number to convert
* @returns integer with digits representing binary value representation of
* number.
*/
int decimal_to_binary(unsigned int number)
{
return number == 0 ? 0 : number % 2 + 10 * decimal_to_binary(number / 2);
}
/** Test function */
void test()
{
const int sets[][2] = {
{0, 0}, {1, 1}, {2, 10}, {3, 11}, {4, 100}, {6, 110}, {7, 111},
/* add more data sets to test */
};
for (int i = 0, size = sizeof(sets) / sizeof(sets[0]); i < size; ++i)
{
assert(decimal_to_binary(sets[i][0]) == sets[i][1]);
}
}
/** Driver Code */
int main()
{
test();
return 0;
}