Question

the output should be something like this:

Enter Character : a
Echo : a

I wrote

int c;
  while (c != EOF)
    {
      printf("\n Enter input: ");
      c = getchar();
      putchar(c);
    }

But I get two Enter Input after the echos.

Answer 1

Two characters are retrieved during input. You need to throw away the carriage return.

int c = 0; 
int cr;
  while (c != EOF) 
    { 
      printf("\n Enter input: "); 
      c = getchar(); 
      cr = getchar();  /* Read and discard the carriage return */
      putchar(c); 
    }