Circle

• 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=12.56

• Test Case 2

  
  Input (stdin)

  25
  
  

  Expected Output

  Area of Circle=1962.50

• Program

• #include <stdio.h>
  int main()
  {
     int a;
    float b;
    scanf("%d",&a);
    b=3.14*(a*a);
    printf("Area of Circle=%.2f",b);
   return 0;
  }