C :

#include<stdio.h>
int main()
{double r;
printf("%0.2f\n",266.0*3.1415926);
}

C++ :

#include<cstdio>
using namespace std;
int main()
{
	float pp=3.1415926;
	float rr,s,hh;
	rr=7; hh=12;
	s=2*pp*rr*rr+2*pp*rr*hh;
	printf("%0.2f\n",s);
	return 0;
}