Use the while statement to calculate and output 1/3-3/5 + 5/7... -19/21 results (computer tasks in week 10)

/** Copyright (c) 2011, School of Computer Science, Yantai University * All Rights Reserved. * file name: test. CPP * Author: Fan Lulu * Completion Date: July 15, October 29, 2012 * version number: V1.0 ** input Description: none * Problem description: computing and output 1/3-3/5 + 5/7... -result of 19/21 *ProgramOutput: Results of 1/3-3/5 + 5/7...-19/21 * Problem Analysis: omitted *AlgorithmDESIGN: slightly */# include <iostream> using namespace STD; int main () {int I, F; double sum; I = 1; F = 1; sum = 0; while (I <= 10) {sum = sum + F * (double (2 * i-1.0)/(2 * I + 1.0); I + = 1; F =-F;} cout <"sum =" <sum <Endl; return 0 ;}

Experience: F is really easy to use.