Difference between \n and \r?

Question

What’s the difference between \\n (newline) and \\r (carriage return)?

In particular, are there any practical differences between

Answer 1

#include 

void main()
{
  int countch=0;
  int countwd=1;

  printf("Enter your sentence in lowercase: ");
  char ch='a';
  while(ch!='\r')
  {
    ch=getche();
    if(ch==' ')
      countwd++;
    else
      countch++;
  }

  printf("\n Words = ",countwd);

  printf("Characters = ",countch-1);

  getch();

}

lets take this example try putting \n in place of \r it will not work and try to guess why?