Thanks for the solution.
But what header file and what data type will make me print this to 1000 decimal places.
just i want "what header file and which data type" please help me
Code:#include <iostream> #include <cmath> #include <iomanip> using namespace std; int main() { int n; cout << setprecision (100) << (12*atan(1.0/49) + 32*atan(1.0/57) - 5*atan(1.0/239) + 12*atan(1.0/110443))*4; cin >> n; return 0; }
Option 1: As already mentioned, use an arbitrary precision math library.
Option 2: There are algorithms for calculating pi digit by digit. E.g one implementation found here (computes 800 digits, code unfortunately obfuscated to take less space):
Code:#include <cstdio> int a=10000,b,c=2800,d,e,f[2801],g; int main() { for(;b-c;) f[b++]=a/5; for(;d=0,g=c*2;c-=14,printf("%.4d",e+d/a),e=d%a) for(b=c;d+=f[b]*a,f[b]=d%--g,d/=g--,--b;d*=b); }
I might be wrong.
Quoted more than 1000 times (I hope).Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
You might be interested in this: GNU MP Pi computation
The code's in C, but you could still learn from it. GMP is a good bignum lib, it has a C++, interface if you're interested.
