calculate the area of ​​a circle

below is a sample program to calculate the area of ​​a circle:

formula to calculate the circle is L = pi * r * r, phi = 3.14 or 22 / 7 here we use the phi = 3.14 with the fingers of the user input
<br /> #include<iostream><br /> #include<stdlib.h><br /> using namespace std;<br /> int main(int argc, char *argv[])<br /> {<br /> int l, r;<br /> cout<<”luas lingkaran \n”;<br /> cout<>r;<br /> cout<<” phi = 3,14 \n”;<br /> l=3.14*r*r;<br /> cout<<”luas lingkaran : “<<l<<endl;< p=""> </l<<endl;<><br /> system(“PAUSE”);<br /> return 0;<br /> }

finish ,now you can calculate the area of ​​a circle with this program