#include <stdio.h>
#include <iostream>
#define p 3.1415926
#define n "Number = "
using namespace std;
void main()
{
system(
"cls"
);
cout << p <<
"\n"
;
// 3.141593
printf(
"%5.4f \n"
,p);
// 3.1416
"%s %5.9f \n"
,n,p);
// Number = 3.141592600
getchar();
}