Create Decimal to Binary,Hex,Octa

For issue ASCI-COEP#31 on ASCI-COEP

Mathematical/Decimal to Binary,Hex,Octa

@@ -0,0 +1,94 @@
+/**********************************************************
+ Program to convert a decimal number to binary, 
+ octal and hexadecimal using recursion 
+ * 
+ * Select conversion: 
+
+ * 1. Decimal to binary. 
+ * 2. Decimal to octal. 
+ * 3. Decimal to hexadecimal. 
+ * 4. Exit. 
+
+ * Enter your choice: 1
+ * Enter a number: 4
+ * Result = 100
+ **********************************************************/
+
+#include<stdio.h> // include stdio.h library
+void convert_to_x_base(int, int);
+
+
+int main(void)
+{
+    int num, choice, base;
+
+    while(1)
+    {
+        printf("Select conversion: \n\n");
+        printf("1. Decimal to binary. \n");
+        printf("2. Decimal to octal. \n");
+        printf("3. Decimal to hexadecimal. \n");              
+        printf("4. Exit. \n");
+
+        printf("\nEnter your choice: ");
+        scanf("%d", &choice);
+
+        switch(choice)
+        {
+            case 1:
+                base = 2;
+                break;
+            case 2:
+                base = 8;
+                break;              
+            case 3:
+                base = 16;
+                break;
+            case 4:
+                printf("Exiting ...");
+                exit(1);
+            default:
+                printf("Invalid choice.\n\n");
+                continue;
+        }
+
+        printf("Enter a number: ");
+        scanf("%d", &num);
+
+        printf("Result = ");
+
+        convert_to_x_base(num, base);
+
+        printf("\n\n");
+    }        
+
+    return 0; // return 0 to operating system
+}
+
+
+void convert_to_x_base(int num, int base)
+{    
+    int rem;
+
+    // base condition
+    if (num == 0)
+    {
+        return;
+    }
+
+    else
+    {
+        rem = num % base; // get the rightmost digit        
+        convert_to_x_base(num/base, base);  // recursive call        
+        if(base == 16 && rem >= 10)
+        {
+            printf("%c", rem+55);
+        }
+
+        else
+        {
+            printf("%d", rem);
+        }
+    }
+
+}