Circle

Points: 1 (partial)

Time limit: 1.0s

Memory limit: 98M

Problem types

Enter the real number as the radius R of a circle. calcule circumference and the area of that circle with the precision of 2 digits after the decimal point, in case R <0, print " NO CIRCLE ”.

Input:

A line of a real number R

Output:

Either 1 result "NO CIRCLE" or two lines corresponding to the circumference, the area of the circle is rounded to 2 digits after the decimal point.

Example 1:

Input:

-3.5

Output:

NO CIRCLE

Example 2:

Input:

3.0

Output:

18.85

28.27

utc

Comments

Kien commented on Sept. 6, 2021, 5:56 a.m.

include<stdio.h>

include<iostream>

using namespace std;

int main(){

int r;
    cout<<"nhap R: ";
    cin>> r;

if(r<0){
    cout<<"NO CIRCLE";
}
    else{

        float s;
        float p;

        p= 3.14*2*r;
        s= 3.14 * r*r;

        cout<<"p= "<< p <<" " <<"s= "<<s;

    }
return 0;

}

Tranthanh commented on Jan. 13, 2019, 9:14 a.m.

include<iostream>

using namespace std;

int main()

{

float n,cv,dt;
cin>>n;

if(n >= 0)
{
    cv = 2 * 3.14 * n;
    dt = 3.14 * n * n;
    cout<<cv<<endl<<dt<<endl;
}
else
{
    cout<<"NO CIRCLE";
}
return 0;

}