Question

Write a c program to calculates the area (floating point number with two decimal places) of a circle given it's radius (integer value). The value of pi is 3.14.

Answer 1

Answer:#include <stdio.h>

 

int main() {

  float radius, area_circle;

 

  // take radius as input

  printf("Enter the radius of circle : ");

  scanf("%f", &radius);

 

  area_circle = 3.14 * radius * radius;

  printf("Area of circle : %f", area_circle);

 

  return 0;

}

Output

Enter the radius of circle : 10.0

Area of circle : 314

Explanation:

Answer 2

Answer:

#include <stdio.h>

#include <math.h>

#define PI 3.14

Int main()

{

Int radius;

float area;

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

scanf("%f", &radius);

area = PI * pow(radius, 2);

printf("Area of a circle = %5.2f\n", area);

}

Explanation:

The PI value is already given so we use #define PI 3.14

And because we use some mathematics calculation we used #include<math.h>

Hader file