Wait for press enter in C inside a while loop?

Question

I'm writing a C program and I need to wait for the user to press any key to continue. When I use getchar(); it waits for the Enter key to be pressed. But when I use it inside a while loop, it doesn't work. How can I make my code wait for any key to be pressed to continue the loop?

Here is my code sample. I am using GNU/Linux.

#include <stdio.h>
#include<stdlib.h>
int main()
{
    int choice;
    while(1) {
        printf("1.Create Train\n");
        printf("2.Display Train\n");
        printf("3.Insert Bogie into Train\n");
        printf("4.Remove Bogie from Train\n");
        printf("5.Search Bogie into Train\n");
        printf("6.Reverse the Train\n");
        printf("7.Exit");
        printf("\nEnter Your choice : ");
        fflush(stdin);
        scanf("%d",&choice);

        switch(choice)
        {
            case 1:
                printf("Train Created.");
                break;
            case 2:
                printf("Train Displayed.");
                break;
            case 7:
                exit(1);
            default:
                printf("Invalid Input!!!\n");
        }

        printf("Press [Enter] key to continue.\n");
        getchar();
    }

    return 0;
}

Answer 1

If this code (with additional fflush)

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int choice;
    while(1){
        printf("1.Create Train\n");
        // print other options
        printf("\nEnter Your choice : ");
        fflush(stdin);
        scanf("%d", &choice);
        // do something with choice
        // ...
        // ask for ENTER key
        printf("Press [Enter] key to continue.\n");
        fflush(stdin); // option ONE to clean stdin
        getchar(); // wait for ENTER
    }
    return 0;
}

does not work properly.

Try this code (with loop):

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int choice;
    while(1){
        printf("1.Create Train\n");
        // print other options
        printf("\nEnter Your choice : ");
        fflush(stdin);
        scanf("%d", &choice);
        // do something with choice
        // ...
        // ask for ENTER key
        printf("Press [Enter] key to continue.\n");
        while(getchar()!='\n'); // option TWO to clean stdin
        getchar(); // wait for ENTER
    }
    return 0;
}