Number Guessing Name

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


int main()
{

    int num;
    int guess;
    int height=100;
    int bottom=1;
    char answ='a';

    printf("Instruction: You have to insert a number from 1 to 100 and I have to guess it.\n"
            "But you have to help me saying me if my guess is higher typing 'h'\n"
            "or 'l' otherwise.\n\n");

    printf("Please insert a number:\n");
    num *scanf("%d", &num);

      srand(time(NULL)); // initialize random number generator
      guess = rand()%100 +1;

    while(guess != num)
{
    printf("The secret number is Higher or Lower than my guess %i?\n",guess);

    answ=getchar();

     if (answ=='l')
     {
        height=guess;
        srand(time(NULL)); // initialize random number generator
        guess = rand()%(height-1-bottom) +(bottom+1);
     }

     if (answ=='h')
     {
        bottom=guess;
        srand(time(NULL)); // initialize random number generator
        guess = rand()%(bottom-height-1) +(bottom+1);
     }

}

    printf("I found it! It's %i",guess);
    return 0;
}