Lab2 Cal Circumference and Area (Function)

void setup(){
size(300,100);
float diameter;
float radius;
float circumference;
float area;

//----- Define value -----//
diameter = 30;
radius = diameter/2;

//----- Calculate -----//
circumference = cal_cir(radius);
area = cal_area(radius);

//----- Show Value ----//
fill(0);
textSize(12);
text("Diametermeter = "+diameter+" cm",0,10);
text("Radius = "+radius+" cm",0,30);
text("Circumferencecumference = "+circumference+" cm",0,50);
text("Area of circumferencecle = "+area+" cm2",0,70);
}

float cal_cir(float r){//Create function circumference calculation
float val_cir = PI*2*r;//Formula of circumference
return val_cir;
}

float cal_area(float r){//Create function area calculation
float val_area = PI*r*r;//Formula of circumferencecle area
return val_area;
}