Choose either method 1 or method 2.
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If method 1 is selected, delete lines 35-43
If method 2 is selected, delete lines 21-33
Both methods give same result.
![main.cpp E saved 1 #include <iostream> #include <string> 3 using namespace std; 4. 5 //This function takes an integer n and prints PI upto n decimal places 6 //For printing upto n decimal places, 7 I/ we can use pi as string and either print decimal characters iteratively (METHOD 1) 8 //or use substr function(METHOD 2) 9 void printPI(int n) 10 11 | İf(n<1 Il n>16) //check if input lies between 1 and 16 12 13 14 15 16 coutくぐInvalid return; input n; //store pi as a constant string. Store upto 18 decimal places //we use string to prevent rounding off const string pi3.141592653589793238; 18 19 20 21 22 //Choose either method 1 or method 2. Remove the other method 23 24 25 26 I/print decimal part upto n decimal places, starting from pi[2] 27 | //As pǐ[0] = 3 and pi [1ド 28 29 30 31 32 /METHOD 1 //print integer part cout<<Pi upto <<n<< decimal places -3.; for(int i=1;i<=n;i++) cout<<pi[1+i]; cout<<endl; -Method 1 END 35 //METHOD 2: 36 37 38 39 //pi.substr (a,b)returns substring of pi from index a 40 41//since we need to print 3. also, we add 2 to n and start from index 0 i.e (0,n+2) 42 43// cout<<Pi upto <<n<< decimal cout&pi. Substr(0,n+2)<<endl; places = // b represents length of substring -Method 2 END 46](https://lh4.googleusercontent.com/0DLgBtkKv8tP-PQdYZ48AetbN3igjEaKUgAYWnCpQlfbNG4r4-R9H32ez5GcMqpaLXZ4P-NaehjqL7ZhwQygiuawmqwhMUvT2o1kjjrGV-npaMLwjCSiBjcCPGD5etuC7TXbba5o)
OUTPUT :
CODE ;
#include <iostream>
#include <string>
using namespace std;
//This function takes an integer n and prints PI upto n decimal places
//For printing upto n decimal places,
// we can use pi as string and either print decimal characters iteratively(METHOD 1)
//or use substr function(METHOD 2)
void printPI(int n)
{
if(n<1 || n>16) //check if input lies between 1 and 16
{
cout<<“Invalid input n”;
return;
}
//store pi as a constant string. Store upto 18 decimal places
//we use string to prevent rounding off
const string pi = “3.141592653589793238”;
//METHOD 1:
//Choose either method 1 or method 2. Remove the other method
//print integer part
cout<<“Pi upto “<<n<<” decimal places = 3.”;
//print decimal part upto n decimal places, starting from pi[2]
//As pi[0] = ‘3’ and pi[1]=’.’
for(int i=1;i<=n;i++)
cout<<pi[1+i];
cout<<endl;
//===============Method 1 END=================
//METHOD 2 :
cout<<“Pi upto “<<n<<” decimal places = “;
cout<<pi.substr(0,n+2)<<endl;
//pi.substr(a,b) = returns substring of pi from index a .
// b represents length of substring
//since we need to print “3.” also, we add 2 to n and start from index 0 i.e (0,n+2)
//===============Method 2 END=================
}
int main()
{
int n;
cout << “Enter no. of decimal places : 1 to 16 : n”;
cin>>n;
printPI(n);
return 0;
}
