A makefile and some random fixes

p11.c

@@ -20,6 +20,7 @@
 /* macro for checking all directions of a square x,y */
 #define check_square(x, y)      \
     do {                        \
+        int p;                  \
         if (x < 17)             \
             setprod(px(x, y));  \
         if (y < 17)             \
@@ -30,6 +31,13 @@
             setprod(prd(x, y)); \
     } while(0)
 
+#define setprod(x)      \
+    do {                \
+        p = x;          \
+        if (p > result) \
+            result = p; \
+    } while(0)
+
 int grid[20][20] = {
     {  8,  2, 22, 97, 38, 15,  0, 40,  0, 75,  4,  5,  7, 78, 52, 12, 50, 77, 91,  8 },
     { 49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48,  4, 56, 62,  0 },
@@ -55,12 +63,6 @@ int grid[20][20] = {
 
 unsigned int result = 0;
 
-void inline setprod(int p) {
-
-    if (p > result)
-        result = p;
-}
-
 int main() {
 
     int x, y;