PI.cpp

/****************
*Finding PI to the Nth Digit
*By Tom Biju
****************/
#include <iostream>
#include <iomanip>	//for setting precision
#include <stdlib.h> 
using namespace std;
//Program to find PI to a specified number of decimal places
int main(int argc, char* argv[]){
 double PI=3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679;
 int decimalPlaces;
 char* commandLine=argv[1];
 if(commandLine==NULL){
 cout<<"Enter how many decimal places of PI you would like to see (limit 100): "<<endl;
 cin>>decimalPlaces;
 decimalPlaces+=1;
 }
 else{
	 decimalPlaces=atoi(commandLine);
	 decimalPlaces+=1;
 }
 cout<<setprecision(decimalPlaces)<<PI<<endl;
 return 0;
}