Input redirection vs keyboard input display

[opera002]

I have a for loop that takes in user input and it displays on a new line, however with input redirection, everything prints on the same line

for example if i manually type ls
the results would be: src makefile bin
the input looks like

$ ls
src makefile bin

but if I use input redirection ./a.out <ls.txt
it appears as

$ src makefile bin

is there a way i can make the input on the next line without so make it look like i manually typed ls?

this is my for loop

info();  
for(string line = ""; getline(cin,input);)
  {
    info();
    //output the username and the host machine
    //this seperates the command into a vector
    SubStrBuilder(comVector,input);
    //turns the vector into postfix notation
    comVector = infix_to_postfix(comVector);

        //return the top node
        master =  compose_tree(comVector);
        //if there is a valid Shell * to execute
        if(master != NULL)
        {
          master->execute();
        }

 }