Merge pull request #51 from jebinphilipose/bin-to-oct

Thanks for contributing

conversions/binary2octal.c

@@ -0,0 +1,52 @@
+// Binary number to octal number conversion
+#include<stdio.h>
+
+//Function that returns the last three digits
+int three_digits(int n)
+{
+    int r, d = 0, p=1;
+
+    for(int i=0; i<3; i++)
+    {
+        r = n%10;
+        d = d + r * p;
+        p = p * 10;
+        n = n / 10;
+    }
+    return d;
+}
+
+int main(void)
+{
+    int binary_num, d=0, base=1, remainder, td, res=0, ord=1;
+
+    printf("Enter the binary no: ");
+    scanf("%d", &binary_num);
+
+    while(binary_num > 0)
+    {
+        if(binary_num > 111) //Checking if binary number is greater than three digits
+            td = three_digits(binary_num);
+
+        else td = binary_num;
+
+        binary_num = binary_num / 1000;
+
+        d = 0, base =1;
+
+        // Converting the last three digits to decimal
+        while(td > 0)
+        {
+            remainder = td % 10;
+            td = td / 10;
+            d = d + (base * remainder);
+            base = base * 2;
+        }
+
+        res = res + d * ord; // Calculating the octal value
+        ord = ord * 10;
+    }
+
+    printf("\nOctal equivalent is: %d", res);
+    return 0;
+}