first program in c, random number generator and have them guess it

i took java for a while and i'm switching over to C, this is my first program and i have to get a number over 99 from the user, create a random number from 1 to that number, and try to have them guess it. i'm having some troubles trying to get it to compile. can i get general tips and help as to what i'm doing wrong(why it won't compile)?

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {

    char goAgain = "y";
    int theNum = 1;
    int guess;

    do{
        do{
            printf("Enter a number over 99");
            scan f("%d", &theNum);
            if(theNum <= 99) {
                printf("Please enter a number over 99");
            }
        }while(theNum <= 99);
        do{

            srand(time(NULL));
            theNum = rand() % theNum+1;
            printf("Please enter a guess");
            scanf("%d", &guess);
            if(guess > theNum) {
                printf("Too high");
            }
            if(guess < theNum) {
                printf("Too high");
            }
            else {
                printf("That's correct!");
            }
        }while(theNum != guess);

        printf("Would you like to play again? (y/n)");
        goAgain = getchar();
        while(getchar == "\n"){
        }
    }while(goAgain == "y");
    return(0);
}