Write a c program to find the radius, diameter and circumference of a circle fro

Question

Write a c program to find the radius, diameter and circumference of a circle from its Area.

Display error if negative, zero or alphabets are inputted.

Given: r: radius

d: diameter

c: circumference
area

PI == 3.141592653589793 == acos(-1) (w cmath)

all vars above > 0
Formula:

d = 2r

c = PI*d
area = PI * r^2

The program I wrote:

#include
#include

const double PI=3.14592653589793;
double radiusFromArea(double area);
double diameterFromRadius(double r);
double circumferenceFromDiameter(double d);

int die(const char*msg);

int main()
{
   double area;
   double r, d, c;
   printf_s("area: ");
   if (scanf_s ("%lf", &area) !=1) die ("input failure");
   if (area<=0) die ("non-positive input");
   radiusFromArea (area);
   diameterFromRadius (r);
   circumferenceFromDiameter (d);
   printf_s("radius%f, diameter%f, circumference%f ", r, d, c);
}

double radiusFromArea(double r)
{
   return (r*r)*PI;

}
double diameterFromRadius(double r)
{
   return r*2;
}
double circumferenceFromDiameter(double d)
{
return PI*d;
}

int die(const char*msg) {
   printf_s("Fatal error: %s ", msg);
   exit(EXIT_FAILURE);

}

The problem I'm having is whenever I input the area, an error pops saying the variables are nt initilized. Can't figure out why!

Explanation / Answer

int die the variable pointer char * msg is not iniilized and

try putting it simple

if (scanf_s ("%lf", &area) !=1) die ("input failure");
   if (area<=0) die ("non-positive input");

instead validate in main.

#include<stdio.h>
#include <math.h>
const double PI=3.14592653589793;
double radiusFromArea(double);
double diameterFromRadius(double);
double circumferenceFromDiameter(double d);
int main()
{
double area,r,d,c;
printf(" Enter the area of the circle : ");
scanf("%lf",&area);
if (area <=0){
printf("FATAL ERROR: Ener valid area and try again!");
}
else
{
r = radiusFromArea(area);
printf(" Radius of Circle : %lf ",r);
d=diameterFromRadius(r);
printf(" Diameter of Circle : %lf ",d);
c=circumferenceFromDiameter(d);
printf(" Circumference of Circle : %lf ",c);
}
  
return(0);
}
double radiusFromArea(double area)
{
double ar,radius;
ar=area;
radius = sqrt(PI/ar);
return(radius);
}
double diameterFromRadius(double r)
{
return r*2;
}
double circumferenceFromDiameter(double d)
{
return PI*d;
}

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.