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Added octal to binary conversion (#629) 

* Added octal to binary conversion

* Update conversions/octal_to_binary.c

Co-authored-by: David Leal <halfpacho@gmail.com>

* Update conversions/octal_to_binary.c

Co-authored-by: David Leal <halfpacho@gmail.com>

* Changes updated

* To trigger action

* updating DIRECTORY.md

* LGTM alert  fixed.

Co-authored-by: David Leal <halfpacho@gmail.com>
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
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Vishnu P 2020-10-02 17:46:27 +05:30 committed by GitHub
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DIRECTORY.md
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@ -18,6 +18,7 @@
* [Decimal To Octal Recursion](https://github.com/TheAlgorithms/C/blob/master/conversions/decimal_to_octal_recursion.c)
* [Hexadecimal To Octal](https://github.com/TheAlgorithms/C/blob/master/conversions/hexadecimal_to_octal.c)
* [Int To String](https://github.com/TheAlgorithms/C/blob/master/conversions/int_to_string.c)
* [Octal To Binary](https://github.com/TheAlgorithms/C/blob/master/conversions/octal_to_binary.c)
* [Octal To Decimal](https://github.com/TheAlgorithms/C/blob/master/conversions/octal_to_decimal.c)
* [To Decimal](https://github.com/TheAlgorithms/C/blob/master/conversions/to_decimal.c)

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conversions/octal_to_binary.c Normal file
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/**
* @brief Octal to binay conversion by scanning user input
* @details
* The octalTobinary function take the octal number as long
* return a long binary nuber after conversion
* @author [Vishnu P](https://github.com/vishnu0pothan)
*/
#include <stdio.h>
#include <math.h>
/**
* @brief Converet octal number to binary
* @param octalnum octal value that need to convert
* @returns A binary number after conversion
*/
long octalToBinary(int octalnum)
{
int decimalnum = 0, i = 0;
long binarynum = 0;
/* This loop converts octal number "octalnum" to the
* decimal number "decimalnum"
*/
while(octalnum != 0)
{
decimalnum = decimalnum + (octalnum%10) * pow(8,i);
i++;
octalnum = octalnum / 10;
}
//i is re-initialized
i = 1;
/* This loop converts the decimal number "decimalnum" to the binary
* number "binarynum"
*/
while (decimalnum != 0)
{
binarynum = binarynum + (long)(decimalnum % 2) * i;
decimalnum = decimalnum / 2;
i = i * 10;
}
//Returning the binary number that we got from octal number
return binarynum;
}
/**
* @brief Main function
* @returns 0 on exit
*/
int main()
{
int octalnum;
printf("Enter an octal number: ");
scanf("%d", &octalnum);
//Calling the function octaltoBinary
printf("Equivalent binary number is: %ld", octalToBinary(octalnum));
return 0;
}