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Menhitung keliling lingkaran




#include <iostream>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
float kel_ling(float j){
float phi=3.1415926535897932384626433832795;
return (phi*j*2);
}

int main(int argc, char** argv) {
float j;
cout<<"masukkan jari-jari lingakran= "; cin>>j;
cout<<"keliling lingkaran = "<<kel_ling(j);
return 0;
}