Question

write programs write the area of a circle using #define​

Answer 1

Answer:

// C++ program to find area

// of circle

#include <iostream>

const double pi = 3.14159265358979323846;

using namespace std;

// function to calculate the area of circle

float findArea(float r)

{

return (pi * r * r);

}

// driver code

int main()

{

float r, Area;

r = 5;

// function calling

Area = findArea(r);

// displaying the area

cout << "Area of Circle is :" << Area;

return

Output:

Area is 78.550000

Answer 2

Answer:

#include < stdio.h >    

#include < conio.h > #define PI 3.141  

int main()    

{  

   float radius, area;  

   printf("Enter radius of circle\n");  

   scanf("%f", & radius);  

   area = PI * radius * radius;  

   printf("Area of circle : %0.4f\n", area);  

   getch();  

   return 0;  

}  

Explanation:

Through programming, finding an area of a circle is clearly understood.