diff --git a/csim.c b/csim.c
index 44fdd4b..e66cd5a 100644
--- a/csim.c
+++ b/csim.c
@@ -1,7 +1,56 @@
+#include <stdlib.h>
+#include <stdio.h>
 #include "cachelab.h"
 
-int main()
+void print_usage()
 {
+	printf("Usage:\n");
+	exit(0);
+}
+
+int parse_int_arg(char* arg)
+{
+	int i = atoi(arg);
+	if (i != 0)
+		return i;
+	else
+		exit(-1);
+}
+
+int main(int argc, char* argv[])
+{
+	int set_bits = 0, lines = 0, block_bits = 0, verbose = 0;
+	char* filename;
+	int ii;
+	for (ii = 0; ii < argc; ii++)
+	{
+		switch (argv[ii][1])
+		{
+		case 'h':
+			//print_usage();
+			break;
+		case 'v':
+			verbose = 1;
+			break;
+		case 's':
+			set_bits = parse_int_arg(argv[ii+1]);
+			break;
+		case 'E':
+			lines = parse_int_arg(argv[ii+1]);
+			break;
+		case 'b':
+			block_bits = parse_int_arg(argv[ii+1]);
+			break;
+		case 't':
+			filename = argv[ii+1];
+			break;
+		}
+	}
+
+	printf("Arguments: %d, %d, %d, %d, %s\n", set_bits, lines, block_bits, verbose, filename);
+	if(!set_bits|| !lines || !block_bits || !filename)
+		print_usage();
+
     printSummary(0, 0, 0);
     return 0;
 }