diff --git a/file3.c b/file3.c
new file mode 100644
index 0000000..704cf52
--- /dev/null
+++ b/file3.c
@@ -0,0 +1,100 @@
+#include <stdio.h>
+
+void print(int board[9][9]){
+	printf("|-----------------------|\n");
+	int i,j;
+	for(i=0;i<9;i++){
+		printf("| ");
+		for(j=0;j<9;j++){
+			if(board[i][j]==0) printf(". ");
+			else printf("%d ",board[i][j]);
+			if(j%3==2) printf("| ");
+		}
+		printf("\n");
+		if(i%3==2){
+			printf("|-----------------------|\n");
+		}
+	}
+}
+
+void check(int board[9][9]){
+	printf("The original Sudoku matrix:\n");
+	print(board);
+	int i,j,k;
+	
+	//判断每一行数字是否重复 
+	for(i=0;i<9;i++){
+		int cnt[10]={}; //统计每个数字出现次数 
+		for(j=0;j<9;j++){
+			cnt[board[i][j]]++;
+		}
+		for(j=1;j<=9;j++){
+			if(cnt[j]>1){
+				printf("False:Invalid initial Sudoku matrix!\n");
+				printf("The number %d in the col %d has been used!\n",j,i+1);
+				return;
+			}
+		}
+	}
+	
+	//判断每一列数字是否重复 
+	for(i=0;i<9;i++){
+		int cnt[10]={}; //统计每个数字出现次数
+		for(j=0;j<9;j++){
+			cnt[board[j][i]]++;
+		}
+		for(j=1;j<=9;j++){
+			if(cnt[j]>1){
+				printf("False:Invalid initial Sudoku matrix!\n");
+				printf("The number %d in the row %d has been used!\n",j,i+1);
+				return;
+			}
+		}
+	}
+	
+	//判断每个九宫格数字是否重复 
+	for(k=0;k<9;k++){
+		int cnt[10]={}; //统计每个数字出现次数
+		//起始行为k/3*3 
+		for(i=k/3*3;i<k/3*3+3;i++){
+			//起始列为k%3*3 	
+			for(j=k%3*3;j<k%3*3+3;j++){
+				cnt[board[i][j]]++;
+			}
+		}
+		for(j=1;j<=9;j++){
+			if(cnt[j]>1){
+				printf("False:Invalid initial Sudoku matrix!\n");
+				printf("The number %d in the block %d has been used!\n",j,k+1);
+				return;
+			}
+		}
+	}
+	printf("True:Valid initial Sudoku matrix!\n");
+}
+
+int main(){
+	int board0[9][9] = {{5, 3, 0, 0, 7, 0, 0, 0, 0}, 
+						{6, 0, 0, 1, 9, 5, 0, 0, 0}, 
+						{0, 9, 8, 0, 0, 0, 0, 6, 0}, 
+						{8, 0, 0, 0, 6, 0, 0, 0, 3}, 
+						{4, 0, 0, 8, 0, 3, 0, 0, 1}, 
+						{7, 0, 0, 0, 2, 0, 0, 0, 6}, 
+						{0, 6, 0, 0, 0, 0, 2, 8, 0}, 
+						{0, 0, 0, 4, 1, 9, 0, 0, 5}, 
+						{0, 0, 0, 0, 8, 0, 0, 7, 9}};
+	int board1[9][9] = {{8, 3, 0, 0, 7, 0, 0, 0, 0}, 
+						{6, 0, 0, 1, 9, 5, 0, 0, 0}, 
+						{0, 9, 8, 0, 0, 0, 0, 6, 0}, 
+						{8, 0, 0, 0, 6, 0, 0, 0, 3}, 
+						{4, 0, 0, 8, 0, 3, 0, 0, 1}, 
+						{7, 0, 0, 0, 2, 0, 0, 0, 6}, 
+						{0, 6, 0, 0, 0, 0, 2, 8, 0}, 
+						{0, 0, 0, 4, 1, 9, 0, 0, 5}, 
+						{0, 0, 0, 0, 8, 0, 0, 7, 9}};
+	check(board0);
+	check(board1);
+	
+	return 0;
+}
+