#include<iostream>
#include<constrea.h>
#include<cstring>
#include<windows>
main()
{
system("color
4b");
const float phi = 3.14;
int
jari_jari, hasil;
cout<<"\t***************************************************"<<endl;
cout<<"\t* PERHITUNGAN LUAS DAN KELILING
LINGKARAN *"<<endl;
cout<<"\t***************************************************"<<endl<<endl;
cout<<"\t\t\t Pilih Perhitungan
"<<endl;
string luas="\t\t\t (1) luas";
cout<<luas<<endl;
string keliling="\t\t\t (2) keliling";
cout<<keliling<<endl<<endl;
cout<<"\t***************************************************"<<endl<<endl;
cout<<"\tmasukan jari jari 1 =
";
cin>>jari_jari;
cout<<"\tmasukan jari jari 2 =
";
cin>>jari_jari;
a:
int z;
cout<<"\n\tmasukan nomer Pilih
Perhitungan = ";
cin>>z; cout<<"
"<<endl;
if(z==1)
{ hasil
= phi*jari_jari*jari_jari;
cout<<"\thasil
perhitungan luas lingkaran = "<<hasil<<endl;}
else if(z==2)
{ hasil
= 2*phi*jari_jari;
cout<<"\n\thasil perhitungan
keliling lingkaran = "<<hasil<<endl;}
else
{ cout<<"\t\tNOMOR
PILIHAN PERHITUNGAN SALAH"<<endl;
goto
a;}
getch();
}
hasilnya:

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