7) Write a program to calculate the area and circumference of the circle using pointer radius variable.

 source file name: Areaptr.C

void main()

{

int rad;

int *radptr;

float acir,cc;

//clrscr();

printf("\n enter radius of circle");

scanf("%d",&rad);

radptr=&rad;

acir=3.1429**radptr**radptr;

cc=2*3.1429**radptr;

printf("\n Area =%f and Circumference  of Circle= %f ",acir,cc);

getch();

}

output: