Exercise 8.32

chp8_memory/mem/.gitignore

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+mem

chp8_memory/mem/Makefile

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+CC=gcc
+CFLAGS=-Wall -o mem
+SRCS=main.c
+
+build:
+	$(CC) $(CFLAGS) $(SRCS)
+debug:
+	$(CC) $(CFLAGS) -fsanitize=address -static-libasan -ggdb $(SRCS)
+	gdb -q mem
+clean:
+	rm -f mem

chp8_memory/mem/main.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[]) {
+  if (argc < 2) {
+    printf("Usage: mem <ADDRESS>\n");
+    return EXIT_FAILURE;
+  }
+
+  const unsigned long n = atoi(argv[1]);
+  const unsigned long page = n >> 12;            // equal to n / 2^12
+  const unsigned long offset = n - (page << 12); // equal to n - (page * 2^12)
+
+  printf("The address %lu contains:\n", n);
+  printf("page number = %lu\n", page);
+  printf("offset = %lu\n", offset);
+
+  return EXIT_SUCCESS;
+}