Complete the following program which calculates and displays the area and perime

Question

Complete the following program which calculates and displays the area and perimeter of a circle Hint: area of circle = circumference of circle = 2r /*Program to find the circumference and area of a circle #include-stdio.h> #define PI 3.142 void main float circum, area; float radius; void circumarea(float, float *, float*); printf"nEnter the radius of a circle in metres:In"); //read radius from the keyboard /call circumarea in main() printf("nCircumference of the circle is %f metres", circum); printf(" Area of the circle is %fsq.metres", area); void circumarea (float r, float *ci, float *ar)

Explanation / Answer

Given below is the code for the question.
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#include <stdio.h>
#define PI 3.142
void main()
{
float circum, area;
float radius;
  
void circumarea(float, float *, float *);
  
printf(" Enter the radius of a circle in meters: ");
scanf("%f", &radius); //read radius from keyboard
  
circumarea(radius, &circum, &area); //call circumarea from main()
  
printf(" Circumference of the circle is %f meters", circum);
printf(" Area of the circle is %f sq.meters ", area);
}

void circumarea(float r, float *ci, float *ar)
{
*ci = 2 * PI * r;
*ar = PI * r * r;
}

output
======
Enter the radius of a circle in meters:
5

Circumference of the circle is 31.420000 meters
Area of the circle is 78.550003 sq.meters

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