Is there a way to get user input without pressing the enter key?

you can use conio.h library and a function _getch() to get input in a live fashion and you can also set loop for multiple inputs.

#include<conio.h>
#include<iostream>
using namespace std;
int main()
{
    char n = 'a'; //Just to initialize it. 
    while(n != 'e') // Will exit if you press e.
    {
        n = _getch();
    }
}

This works for me (I am on linux):

#include <stdio.h>
#include <unistd.h>
#include <termios.h>

int main()
{
    struct termios old_tio, new_tio;
    unsigned char c;

    /* get the terminal settings for stdin */
    tcgetattr(STDIN_FILENO,&old_tio);

    /* we want to keep the old setting to restore them a the end */
    new_tio=old_tio;

    /* disable canonical mode (buffered i/o) and local echo */
    new_tio.c_lflag &=(~ICANON & ~ECHO);

    /* set the new settings immediately */
    tcsetattr(STDIN_FILENO,TCSANOW,&new_tio);

    do {
         c=getchar();
         printf("%d ",c);
    } while(c!='q');

    /* restore the former settings */
    tcsetattr(STDIN_FILENO,TCSANOW,&old_tio);

    return 0;
}

It makes the console unbuffered.

reference: http://shtrom.ssji.net/skb/getc.html