Lab2-Area and Circumferance function

void setup(){
    size(500,500);
}
void draw(){
    background(#FFFF00);
    calCir(98);
}
//calculate circle function//
void calCir(int diameter){
    int r= diameter/2;//radius
    float A;//area
    float cir;//circumference
    cir=2*PI*r;//calculate circumferance
    A=PI*r*r;//calculate area
    showResult(diameter,r,A,cir);
    }
 
void showResult(int diameter,int r,float A,float cir){
      textSize(25);
      fill(0);
      text("Diameter =" +diameter,20,100);
      text("Radius =" +r,20,150);
      text("Circumferance =" +cir,20,200);
      text("area =" +A,20,250);
    }