add some rudimentary math functions

c_os/lib/MyMath.cc

@@ -0,0 +1,26 @@
+#include "MyMath.h"
+
+// NOTE: I added this file
+
+int mymin(int a, int b) {
+    if (a < b) { return a; }
+    return b;
+}
+
+int mymax(int a, int b) {
+    if (a < b) { return b; }
+    return a;
+}
+
+int myabs(int a) {
+    if (a < 0) { return -a; }
+    return a;
+}
+
+int mypow(int a, unsigned int b) {
+    int result = 1;
+    for (unsigned int i = 0; i < b; ++i) {
+        result = result * a;
+    }
+    return result;
+}