IO 11

• Problem Description

  
  Write a program to calculate area of a circle
  
  Input and Output Format:
  
  Refer sample input and output for formatting specification.
  
  All float values are displayed correct to 2 decimal places.
  
  All text in bold corresponds to input and the rest corresponds to output.

• Test Case 1

  
  Input (stdin)

  2
  
  

  Expected Output

  Area of Circle=12.560000
  
  Area of Circle=12.56

• Test Case 2

  
  Input (stdin)

  25
  
  

  Expected Output

  Area of Circle=1962.500000
  
  Area of Circle=1962.50

Solution

#include <stdio.h>

int main()

{

float a,area;

  scanf ("%f",&a);

  area=3.14*a*a;

  printf ("Area of Circle=%0.6f",area);

  printf ("\nArea of Circle=%0.2f",area);  

return 0;

}