diff --git a/check1.c b/check1.c
new file mode 100644
index 0000000..1ac8a1d
--- /dev/null
+++ b/check1.c
@@ -0,0 +1,65 @@
+#include<stdio.h>
+#include<time.h>
+#include<stdlib.h>
+void check(){
+	int check,num;
+	int lie[9][9]={0};
+	int hang[9][9]={0};
+	int kua[9][9]={0};
+	printf("The original Sudoku matrix: ");
+	int i,j;
+	int board[9][9];
+	for(i=0;i<9;i++)
+	{
+		for(j=0;j<9;j++)
+		{
+			printf("%d",board[i][j]);
+		}
+		printf("\n");
+	}
+	for(i=0;i<9;i++)
+	{
+		for(j=0;j<9;j++)
+		{
+			num=board[i][j];
+			if(num<1||num>9)
+			check=0;
+			if(hang[i][num])
+			{
+			check=0;
+			hang[i][num]=1;} 
+			if(lie[i][num])
+			{
+			check=0;
+			lie[i][num]=1;} 
+			if(kua[(i/3)*3+j/3][num])
+			{
+			check=0;
+			kua[(i/3)*3+j/3][num]=1; 
+		    }
+			else
+			check=1;
+		}
+	}
+	if(check==1)
+	printf("True:Valid initial Sudoku matrix!");
+	else
+	printf("False:Invalid initial Sudoku matrix!");
+	for(i=0;i<9;i++)
+	{
+		for(j=0;j<9;j++)
+		{
+			num=board[i][j];
+			if(hang[i][num])
+			printf("The number %d in the hang %d has been
+used!"num,i); 
+			if(lie[i][num])
+		    printf("The number %d in the lie %d has been
+used!"num,i);
+			if(hua[(i/3)*3+j/3][num])
+			printf("The number %d in the kua %d has been
+used!"num,(i/3)*3+j/3); 
+		}
+	}
+
+}