The program must accept the diameter of
the circle as a command line argument and print the area of the circle rounding
it up to 2 decimal places.
Example
Input/Output 1:
Input:
14
Output:
154.00
Example
Input/Output 2:
Input:
14.42
Output:
163.38
Solution:
#include <stdio.h>
#include <stdlib.h>
void main(int c,char *b[])
{
float a = atof(b[1])/2;
printf("%.2f",3.142857*a*a);
}