check solution

sudoku.c

@@ -14,15 +14,15 @@
 // https://en.wikipedia.org/wiki/Sudoku#/media/File:Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg
 /*
 int sudoku[9][9] = {
-    {5,3,0,6,0,0,0,9,8},
+    {5,3,VALUE_UNDEFINED,6,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,9,8},
-    {0,7,0,1,9,5,0,0,0},
+    {VALUE_UNDEFINED,7,VALUE_UNDEFINED,1,9,5,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED},
-    {0,0,0,0,0,0,0,6,0},
+    {VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,6,VALUE_UNDEFINED},
-    {8,0,0,4,0,0,7,0,0},
+    {8,VALUE_UNDEFINED,VALUE_UNDEFINED,4,VALUE_UNDEFINED,VALUE_UNDEFINED,7,VALUE_UNDEFINED,VALUE_UNDEFINED},
-    {0,6,0,8,0,3,0,2,0},
+    {VALUE_UNDEFINED,6,VALUE_UNDEFINED,8,VALUE_UNDEFINED,3,VALUE_UNDEFINED,2,VALUE_UNDEFINED},
-    {0,0,3,0,0,1,0,0,6},
+    {VALUE_UNDEFINED,VALUE_UNDEFINED,3,VALUE_UNDEFINED,VALUE_UNDEFINED,1,VALUE_UNDEFINED,VALUE_UNDEFINED,6},
-    {0,6,0,0,0,0,0,0,0},
+    {VALUE_UNDEFINED,6,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED},
-    {0,0,0,4,1,9,0,8,0},
+    {VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,4,1,9,VALUE_UNDEFINED,8,VALUE_UNDEFINED},
-    {2,8,0,0,0,5,0,7,9}
+    {2,8,VALUE_UNDEFINED,VALUE_UNDEFINED,VALUE_UNDEFINED,5,VALUE_UNDEFINED,7,9}
 };
 */
 
@@ -231,6 +231,38 @@ void setValue(int q, int f, int val) {
     //printDumpSudoku();
 }
 
+bool checkSolution() {
+    bool foundError = false;
+
+    for (int val = 1; val <= 9; val++) {
+        // check for val every quadrat
+        for (int q = 0; q < 9; q++) {
+            if (!isInQuadrat(q, val)) {
+                foundError = true;
+                fprintf(stderr, "Value %d not found in Q %d\n", val, q);
+            }
+        }
+
+        // check for val in every row
+        for (int r = 0; r < 9; r++) {
+            if (!isInRow(r, val)) {
+                foundError = true;
+                fprintf(stderr, "Value %d not found in row %d\n", val, r);
+            }
+        }
+
+        // check for val in every col
+        for (int c = 0; c < 9; c++) {
+            if (!isInCol(c, val)) {
+                foundError = true;
+                fprintf(stderr, "Value %d not found in col %d\n", val, c);
+            }
+        }
+    }
+
+    return !foundError;
+}
+
 int main() {
     printDumpSudoku();
     bool somethingChanged;
@@ -302,4 +334,6 @@ int main() {
     } while (somethingChanged);
 
     printDumpSudoku();
+
+    checkSolution();
 }