How to calculate area of circle and volume of cylinder

CODE

How to calculate area of circle and volume of cylinder

Input Radius, if it is <10 then calculate area of circle else calculate volume of cylinder

int main()

{

    float r,h,a,v;

    printf("\n enter radius less than 10 for area of circle and greater than 10 for volume of cylinder:");

    printf("\n enter radius:");

    scanf("%f",&r);

    if(r<10)

    {

        a=3.14*r*r;

        printf("\n area of circle:%f",a);

    }

    else

    {

        printf("\n enter height of cylinder:");

        scanf("%f",&h);

        v=3.14*r*r*h;

        printf("\n volume of cylinder:%f",v);

    }

}

Output:

enter radius less than 10 for area of circle and greater than 10 for volume of cylinder:

 enter radius:

5

 area of circle:78.500000

AND

enter radius less than 10 for area of circle and greater than 10 for volume of cylinder:

 enter radius:

11

 enter height of cylinder:5

 volume of cylinder:1899.699951