Set up solve state

main.c

@@ -5,10 +5,14 @@
 
 #include "puzz.h"
 
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/time.h>
 
+enum { UNKNOWN = 0xfe };
+
 int main(void)
 {
 	struct timeval tv;
@@ -21,5 +25,27 @@ int main(void)
 	gen();
 	print();
 
+	puzz_t field;
+	memset(field, UNKNOWN, sizeof(field));
+
+	for (int y = 0; y < HEIGHT; ++y) {
+		for (int x = 0; x < WIDTH; ++x) {
+			char c;
+			switch (field[x][y]) {
+			case UNKNOWN:
+				c = '?';
+				break;
+			case MINE:
+				c = 'x';
+				break;
+			default:
+				c = '0' + field[x][y];
+				break;
+			}
+			putchar(c);
+		}
+		putchar('\n');
+	}
+
 	return 0;
 }

puzz.c

@@ -42,9 +42,11 @@ void gen(void)
 
 void print(void)
 {
+	puts("Solution:");
 	for (int y = 0; y < HEIGHT; ++y) {
 		for (int x = 0; x < WIDTH; ++x)
 			putchar(soln[x][y] == MINE ? 'x' : '0' + soln[x][y]);
 		putchar('\n');
 	}
+	putchar('\n');
 }