Question...
An approximate value of pi can be calculated usong the series given below:
Pi=4[11/3+1/51/7+1/9…+((1)n)/(2n+1)]
((1)n)=n is a power for1(for your information)
Write a C++ program to calculate the approximate value of pi using this series.The program takes an input n that determines the number of terms in the approximation of value of pi and outputs the approximation.Includes a loop that allows the users to repeat this calculation for new values n until the user says she or he wants to end the program.
 #include <iostream>

using namespace std;


void prime_num(int);

int main()

{

int retry;


do

{

int x = 100;

prime_num(x);

}


void prime_num( int n)

{

bool Prime=true;


for ( int k = 3; k <= n; k++)

{

for ( int j = 2; j <= n; j++)

{

if ( k!=j &&k % j == 0 )

{

Prime=false;

break; // stop looping

}

}

if (Prime)

{

cout << " do you want to repeat the process?(Yes/No)"\n";

cin >> retry;

} while ( retry='Y' retry='y')


cout << " Prime: " << k << "";

}

Prime = true;

}


}
this coding cannot give me an output n have many error.