Hi I’m a beginner on C++, I try to make a guess number game, what I do is make a random number guess it , and give back how many times user make, I add a char[] for get 5 times history and read it, the question is I try to let user choose delete one of history them choose, and add new game data in there.

#include <iostream>
#include <ctime>

int randomnumber(int rad){
 srand(time(NULL));
    rad = rand()%1000;
    return rad;
}

int main()
{
    
    int bk =0;
    int time;
    int n = 0;
    char his[5];
    
    while(bk != 1){
        
       int user = 0;
       printf("       game menun enter 1 for start gamen enter 2 for check history n enter 3 for finish game");
       std::cin >> (user);
        
       if(user == 1)
         {
        
           printf("walcome to the find number game!n this number will be between 1 to 1000n ");
           time = 0;
           int rnum = randomnumber(1);
           int unum;
           
           //printf("%dn",rnum);//                                                                    test park
        
           while(unum != rnum)
              {
                  printf("please enter yours number:");
                  std::cin >> (unum);
               
                  if (unum > rnum)
                     {
                         printf("nit is too big!!!n");
                     }//if
                  else if(unum < rnum)
                     {
                         printf("nit is too smalln");
                     }// else if
               
                 time = time + 1;
               
             }//while in if     
         printf("you are correct!,you use %d times for finish this gamen",time);
       } //if
  
        
     else if (user == 2)
     {
        for(int t = 1;t < 6;t++)
        {
          if(his[t-1] == -1)
          {
            printf("no datan");
          }//if
            else{
              printf("your game %d is %d timesn",t,his[t-1]);
            }//else
        }//for
         printf("only have 5 size for history, if you play more then 5 times, it will not add inn");

     }//else if
        
        
     else if (user == 3)
      {
        bk = 1;
      }//else if
        
   // printf("time test %dn",time);//                                                                    test park
    //str(time,0);
        
    if (time != 0)
      {
        his [n]= time;
        n = n+1;
      }//if
    
    
    }//while
    printf("thanks for play this game, all data will be delete.");
    
    
     return 0;
}//main

hope to find a idea for how to let user choose delete one of the history, and the next game will save in that which is delete, I try to use number about 1-5 for give user choose which one they want delete, but I have no idea how to after save the new things and going back.For example, game 1 use 2 times, game 2 use 15 times, and user want to delete game 1, after new game game 1 have new data in and how can I let the code read the data start on game 3 not game 2?