feat: c beginning

examples/listing-1.1.c

@@ -0,0 +1,19 @@
+/* This may look like nonsense, but really is -*- mode: C -*- */
+#include <stdio.h>
+#include <stdlib.h>
+
+/* The main thing that this program does. */
+int main(int argc, [[maybe_unused]] char *argv[argc + 1]) {
+  // Declarations
+  double A[5] = {
+      [0] = 9.0,
+      [1] = 2.9,
+      [4] = 3.E+25,
+      [3] = .00007,
+  };
+  // Doing some work
+  for (size_t i = 0; i < 5; ++i) {
+    printf("element %zu is %g, \tits square is %g\n", i, A[i], A[i] * A[i]);
+  }
+  return EXIT_SUCCESS;
+};