Added octal to binary conversion (TheAlgorithms#629)

* Added octal to binary conversion * Update conversions/octal_to_binary.c Co-authored-by: David Leal <[email protected]> * Update conversions/octal_to_binary.c Co-authored-by: David Leal <[email protected]> * Changes updated * To trigger action * updating DIRECTORY.md * LGTM alert fixed. Co-authored-by: David Leal <[email protected]> Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Gaminee · Oct 2, 2020 · a050a48 · a050a48
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diff --git a/DIRECTORY.md b/DIRECTORY.md
@@ -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)
 

diff --git a/conversions/octal_to_binary.c b/conversions/octal_to_binary.c
@@ -0,0 +1,62 @@
+/**
+ * @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;
+}