What is the output? What is the meaning of '?' and ':'here?

void printStarsB(int numStars) {

int i = 0;

i = (numStars % 2 == 1) ? numStars : numStars + 1;

while (i >= 1) {

int j;

for (j = 0; j < i; j++)

printf("*");

printf(" ");

i-=2;

}

}