I am have a difficulty understanding getchar(). In the following program getchar works as expected:

#include <stdio.h>


int main()
{
    printf("Type Enter to continue...");
    getchar();
    return 0; 
} 

However, in the following program, getchar does not create a delay and the program ends:

#include <stdio.h>

int main()
{
    char command[100];
    scanf("%s", command );
    printf("Type Enter to continue...");
    getchar();
    return 0; 
} 

I have the following weired workaround, which works, but I understand why:

#include <stdio.h>

int main()
{
    char command[100];
    int i;
    scanf("%s", command );
    printf("Type Enter to continue...");
    while ( getchar() != '\n') {
      i=0; 
    }
    getchar();
    return 0;    
}

So my questions are:
1. What is scanf doing? Why does scanf do this ?
2. Why is my work around working?
3. What is a good way to emulate the following Python code:

raw_input("Type Enter to continue")