From 4c75a67651e246e91f7fb534194ff80832f04f24 Mon Sep 17 00:00:00 2001
From: Shubham Saini <42760891+anon6405@users.noreply.github.com>
Date: Fri, 4 Oct 2019 14:34:44 +0530
Subject: [PATCH] Create hexal_to_octal.c

---
 conversions/hexal_to_octal.c | 134 +++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 conversions/hexal_to_octal.c

diff --git a/conversions/hexal_to_octal.c b/conversions/hexal_to_octal.c
new file mode 100644
index 00000000..d60d6a43
--- /dev/null
+++ b/conversions/hexal_to_octal.c
@@ -0,0 +1,134 @@
+**
+ * C program to convert Hexadecimal to Octal number system
+ */
+
+#include <stdio.h>
+
+int main()
+{
+    char hex[17];
+    long long octal, bin, place;
+    int i = 0, rem, val;
+
+    /* Input hexadecimal number from user */
+    printf("Enter any hexadecimal number: ");
+    gets(hex);
+
+    octal = 0ll;
+    bin = 0ll;
+    place = 0ll;
+
+    /* Hexadecimal to binary conversion */
+    for(i=0; hex[i]!='\0'; i++)
+    {
+        bin = bin * place;
+
+        switch(hex[i])
+        {
+            case '0':
+                bin += 0;
+                break;
+            case '1':
+                bin += 1;
+                break;
+            case '2':
+                bin += 10;
+                break;
+            case '3':
+                bin += 11;
+                break;
+            case '4':
+                bin += 100;
+                break;
+            case '5':
+                bin += 101;
+                break;
+            case '6':
+                bin += 110;
+                break;
+            case '7':
+                bin += 111;
+                break;
+            case '8':
+                bin += 1000;
+                break;
+            case '9':
+                bin += 1001;
+                break;
+            case 'a':
+            case 'A':
+                bin += 1010;
+                break;
+            case 'b':
+            case 'B':
+                bin += 1011;
+                break;
+            case 'c':
+            case 'C':
+                bin += 1100;
+                break;
+            case 'd':
+            case 'D':
+                bin += 1101;
+                break;
+            case 'e':
+            case 'E':
+                bin += 1110;
+                break;
+            case 'f':
+            case 'F':
+                bin += 1111;
+                break;
+            default:
+                printf("Invalid hexadecimal input.");
+        }
+
+        place = 10000;
+    }
+
+    place = 1;
+
+    /* Binary to octal conversion */
+    while(bin > 0)
+    {
+        rem = bin % 1000;
+
+        switch(rem)
+        {
+            case 0:
+                val = 0;
+                break;
+            case 1:
+                val = 1;
+                break;
+            case 10:
+                val = 2;
+                break;
+            case 11:
+                val = 3;
+                break;
+            case 100:
+                val = 4;
+                break;
+            case 101:
+                val = 5;
+                break;
+            case 110:
+                val = 6;
+                break;
+            case 111:
+                val = 7;
+                break;
+        }
+
+        octal = (val * place) + octal;
+        bin /= 1000;
+
+        place *= 10;
+    }
+
+    printf("Hexadecimal number = %s\n", hex);
+    printf("Octal number = %lld", octal);
+
+    return 0;
+}