Calculate the value of PI from the infinite series, - C++ Operator

C++ examples for Operator:Arithmetic Operator

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Description

Calculate the value of PI from the infinite series, 


formula

           4     4     4     4     4 
PI  = 4 - --- + --- - --- + --- - ---- + 
           3     5     7     9     11

Print a table that shows the approximate value of PI after each of the first 1000 terms of this series.

Demo Code

#include <iomanip>
#include <iostream>

int main(int argc, const char *argv[]) {
    int toggle = 0;
    int limit = 1000;

    double pi = 4.0f;
    double divisor = 3.0f;

    std::cout << "Term" << std::setw(4) << "\tPI Approx" << std::endl;

    for (int i = 1; i <= limit; i++) {
        if (toggle == 0)
            pi -= (4.0f / divisor);/*from www.  j  a  va2s .  c  o m*/
        else
            pi += (4.0f / divisor);

        // bit toggle for + - switching above
        toggle = (1 - toggle);

        divisor += 2;

        std::cout << i << std::setw(4) << "\t" << pi << std::endl;
    }
    return 0;
}

Result


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