whats going on here? (C shorthand if else)

I am self-learning C from the internet and I am currently on the if-else statement module.

I wrote this test program using the shorthand if else statement and it ran successfully:

  int bodycount;

  printf("How many people have you smiled at today ?: ");
  scanf(" %d", &bodycount);

  printf("you have smiled at %d %s ", bodycount, (bodycount != 1) ? "people today" : "person today");

However, I tweaked the program slightly to the underlying program:

  int bodycount;

  printf("How many people have you smiled at today?: ");
  scanf(" %d", &bodycount);

  printf("you have smiled at %d %s ", bodycount, (bodycount = 1) ? "person today" : "people today");

I noticed that it only responds correctly when bodycount = 1.

Why is this the case?