first commit!

power.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int power(int m, int n);
+
+int main() {
+  for (int i = 0; i < 10; ++i)
+    printf("%d %d %d\n", i, power(2, i), power(-3, i));
+}
+
+int power(int base, int n) {
+  int p = 1; /* 0th power of any number */
+  for (int i = 1; i <= n; ++i)
+    p *= base;
+  return p;
+}