Added simple implementation of hex/octal conversion

ch_03/exercise_03-05/main.c

@@ -10,8 +10,39 @@
 
 #include <stdio.h>
 
+#include "hex.h"
+
+void test();
+
 int main()
 {
+    test();
 
     return 0;
 }
+
+
+void test()
+{
+    char *number = "21";
+    char hex_number[1024];
+
+    HexOctalConv_number_converted_to_hex(hex_number, number);
+
+    printf("%s converted to hex is %s\n", number, hex_number);
+
+    number = "55";
+    HexOctalConv_number_converted_to_hex(hex_number, number);
+    printf("%s converted to hex is %s\n", number, hex_number);
+
+    const int numerical_value = HexOctalConv_hex_converted_to_number(hex_number);
+    printf("Hexidecimal %s is %d\n", hex_number, numerical_value);
+
+    char octal_number[1024];
+    HexOctalConv_number_converted_to_octal(octal_number, number);
+    printf("%s converted to octal is %s\n", number, octal_number);
+
+    const int o_numberical_value = HexOctalConv_octal_converted_to_number(octal_number);
+    printf("Octal %s converted to a numerical value is %d\n", octal_number, o_numberical_value);
+
+}