#include<iostream> using namespace std; int main(){/** int a;//d scanf("%d",&a) cout<<a; int a; char b; float c; double d; long long e; scanf("%d %c %f %lf %lld ",&a,&b,&c,&d,&e); cout<<a<<""<<b<<""<<c<<""<<e<<endl; int a,b; scanf("%3d%1d",&a,&b); cout<<b<<a; int a,b,c,d,e; scanf("%1d%1d%1d%1d%1d",&a,&b,&c,&d,&e); cout<<e<<d<<c<<b<<a; printf("%s","Hello,World"); printf("%s%s%s%s%s%s%s","*\n""**\n""***\n""****\n""*****\n""******"); printf("%s","1+2"); printf("%d","1+2"); double a,b; scanf("%lf %lf",&a,&b); printf("%.2lf",a/b);**/ double r; scanf("%lf %lf",&r); printf("%.2lf",3.1415926*r*r); return 0; }