Novice C language learning journey(9)

How to delete the content of outputted?I want to delete the content of '*' on console.I used the "\b" on the printf statement.But the code can not implement this function.Because it delete one line only.The code as follows:

   #include"stdio.h"
   #include"stdlib.h"
   #include"windows.h"
   #include"stdio.h"
   main(){
   int i,j,k;
   k=0;
   char a[2][2]={{'*','*'},{'*','*'}};  
   for(i=0;i<=1;i++){
         for(j=0;j<=1;j++){     
               printf("%c",a[i][j]);
   }
  if(k>=1)
    ;
    else
        printf("\n");
  k++;
  }
  Sleep(2000);
  printf("\b\b\b\b    \n");
  system("pause");
  }

No long after,I found it can implement the function when added the statement of "system("cls")".The modified as follows:

  #include"stdio.h"
  #include"stdlib.h"
  #include"windows.h"
  #include"stdio.h"
  main(){
  int i,j,k;
  k=0;
  char a[2][2]={{'*','*'},{'*','*'}};  
  for(i=0;i<=1;i++){
        for(j=0;j<=1;j++){     
              printf("%c",a[i][j]);
  }
  if(k>=1)
    ;
    else
        printf("\n");
  k++;
  }
  Sleep(2000);
  printf("\b\b\b\b    \n");
  Sleep(2000);
  system("cls");
  system("pause");
  }