Write a C programing to generate random number between 1 to 100

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

int main()
{
	int *addr, random, lower, upper, choice, count;

	FILE *f1ptr, *f2ptr;

   f1ptr = fopen("a.txt","w");
   f2ptr = fopen("random.txt", "a+");
   if(f1ptr == NULL || f2ptr == NULL)
   {
      printf("Error!");   
      exit(1);             
   }

   do{
      printf("\nEnter the lower and upper bound: ");
      scanf("%d %d", &lower, &upper);

      addr = (int *)malloc(sizeof(int));

      fprintf(f1ptr, "%d", addr);

      fscanf(f1ptr, "%d", &random);

      fclose(f1ptr);

      if(random < 0)
         random *= -1;

      random = (random % (upper - lower)) + lower;

      printf("%d\n", random);

      fprintf(f2ptr, "%d", random);

      printf("Press 1 to continue or 0 to exit: ");
      scanf("%d", &choice);

      printf("\n");
   }while(choice != 0);

   fclose(f2ptr);
   
	return 0;
}