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try.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+
+void generate_sudoku(int board[9][9]) {
+    srand(time(NULL));
+    int i,j;
+    for (i = 0; i < 9; i++) {
+        for ( j = 0; j < 9; j++) {
+            board[i][j] =rand()%10;
+            
+        }
+    }
+}
+
+void print_sudoku(int board[9][9]) {
+	int i,j;
+    for ( i = 0; i < 9; i++) {
+        for (j = 0; j < 9; j++) {
+            printf("%d ", board[i][j]);
+        }
+        printf("\n");
+    }
+}
+
+
+int test(int board[9][9]) {
+	int i,j,k,p,q;
+    for (i = 0; i < 9; i++) {
+        for (j = 0; j < 9; j++) {
+            if (board[i][j] != 0) {
+                for (k = 0; k < 9; k++) {
+                    if (k != j && board[i][j] == board[i][k]) {
+                        printf("False:Invalid initial Sudoku matrix!\n");
+                        printf("The number %d in the col %d has been used!\n", board[i][j], j + 1);
+                        return 0;
+                        break;
+                    }
+                    if (k != i && board[i][j] == board[k][j]) {
+                        printf("False:Invalid initial Sudoku matrix!\n");
+                        printf("The number %d in the row %d has been used!\n", board[i][j], i + 1);
+                        return 0;      
+						break;          
+                    }
+                }
+                for (p = i / 3 * 3; p < i / 3 * 3 + 3; p++) {
+                    for (q = j / 3 * 3; q < j / 3 * 3 + 3; q++) {
+                        if ((p != i || q != j) && board[i][j] == board[p][q]) {
+                            printf("False:Invalid initial Sudoku matrix!\n");
+                            printf("The number %d in the block %d has been used!\n", board[i][j], (p / 3) * 3 + q / 3 + 1);
+                            return 0;
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+    }
+    printf("True:Valid initial Sudoku matrix!\n");
+    return 1;
+}
+
+
+int add(int board[9][9]) {
+	int row,col,num;
+    for (row = 0; row < 9; row++) {
+        for (col = 0; col < 9; col++) {
+            if (board[row][col] == 0) {
+                for (num = 1; num <= 9; num++) {
+                    if (test(board)) {
+                        board[row][col] = num;
+                        if (add(board)) {
+                            return 1;
+                        } 
+					else {
+                        board[row][col] = 0;
+                        }
+                    }
+                }
+                return 0;          
+            }
+        }
+    }
+    return 1;
+}
+
+
+int main() {
+    int board[9][9];
+    generate_sudoku(board);
+    printf("The original Sudoku matrix:\n");
+    print_sudoku(board);
+    test(board);
+    if (add(board)) {
+    	printf("The solution of Sudoku matrix:\n");
+        print_sudoku(board);
+    } else {
+        printf("No solution\n");
+    }
+    return 0;
+}
+