Lab 3 part A

#include <stdio.h>// library standard
#include <math.h>
#define Pi 3.14159265

double R(num1) {//function to find radius
  return num1/2; //definition
}
double pow(double num1, double num2);// radius^2
double cbrt(double num1 ){//function to find radius^3.
  return num1*num1*num1;
}
double SA(double num1, double num2, double num3){//function to find surface area.
  double result;
  result=num1*num2*num3;
  return result;
  }
double circum(double num1, double num2){
double result; //For circumference
result= num1* num2;
return result;
}
double vol(double num1, double num2, double num3, double num4){
  double result;
  result=((num1*num2)/num3)*num4;
  return result;
  }

int main(void){
double D; //declare the diameter variable as double
double Y=2;//declare the variables
int G=3;
int H=4;


for(double i=0;i<=3;i++)//The For loop limits the amount of loops to 4 although it says 3.
{ printf("\n\nEnter the Diameter: ");
 scanf("%lg",&D);

  if(D>=0){
    double Radius;
    Radius= R(D);
     double radius2;
    radius2= pow(Radius, Y);
    double radius3;
    radius3= cbrt(Radius);
    double surfacearea;
surfacearea=SA(H,Pi,radius2);
     double circumference;
    circumference=circum(Pi,D);
    double volume;
   volume= vol(H,Pi,G,radius3);
   printf("\nThe measurements of a sphere: \nThe Diameter is: %lg.\n And the Radius is: %lg. \n Surface Area is: %lg.\n The Circumference is: %lg.\n The Volume is: %lg",D,Radius, surfacearea,circumference,volume);
}

if (D<0){ double Radius;
    Radius= R(D);
     double radius2;
    radius2= pow(Radius, Y);
    double radius3;
    radius3= cbrt(Radius);
    double surfacearea;
surfacearea=SA(H,Pi,radius2);
     double circumference;
    circumference=circum(Pi,D);
    double volume;
   volume= vol(H,Pi,G,radius3);
  printf("\nThe measurements of a sphere: \nThe Diameter is: %lg.\n And the Radius is: %lg. \n Surface Area is: %lg.\n The Circumference is: %lg.\n The Volume is: %lg\n TOO LOW, STOP! ",D,Radius, surfacearea,circumference,volume);return 1;}
else;}
return 0;}