diff --git a/all.c b/all.c
index 2a671e8..513e254 100644
--- a/all.c
+++ b/all.c
@@ -149,5 +149,5 @@ int main(){
     printf("The solution of Sudoku matrix:\n");
     sudokuPrint(*pres);
     end=clock();
-    printf("dur:%ldms\n", end-st);
+    printf("dur:%.1lfms\n", ((double)end-st)/CLOCKS_PER_SEC*1000);
 }
\ No newline at end of file