write a program in C to find the area of triangle ?

#include 
#include 
int main()

{
double l=4.0, b=2.0,area;
double *lp,*bp, *parea;
lp=&l;
bp=&b;
parea=&area;
*parea= 0.5 * (*lp) * (*bp);
printf("%lf", *parea);
getch();

}