Segmentation fault (core dumped)

Question

#include<stdio.h>
#include<math.h>
int main()
{
    double baseprice;
    int tip_per;
    int tax_per;
    scanf("%lf",baseprice);
    scanf("%d",tip_per);
    scanf("%d",tax_per);
    double tp=(double) tip_per;
    double tx= (double)tax_per;
    double tip=baseprice*(tp/100);
    double tax=baseprice*(tx/100);
    double total_bill=round(baseprice+tip+tax);
    printf("%lf",total_bill);
    return 0;
}

Answer 1

scanf needs pointer so use

 scanf("%lf",&baseprice);
 scanf("%d",&tip_per);
 scanf("%d",&tax_per);

Answer 2

The scanf() function needs pointers to the variables being read in, not current values.  Use the & operator to create a pointer to a variable:

    scanf("%lf", &baseprice);
    scanf("%d", &tip_per);
    scanf("%d", &tax_per);

Also, the printf format for a double is just %f, not %lf.

    printf("%f", total_bill):