Compute the natural logarithm of 2, by adding up to n terms in the series 1 - 1/2 + 1/3 - 1/4 + 1/5 -... 1/n where n is a positive integer and input by user

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Assignments » Flow Of Control » Set 2 » Solution 14

Source Code: 

#include<iostream>
using namespace std;

int main()
{
 int i,n,sign=-1;
 float sum=0;
 cout<<"Enter the value of n ";
 cin>>n;

 for(i=1;i<=n;i++)
 {
  sign *= -1;
  sum += sign*1.0/i;
 }
 cout<<"log 2 : "<<sum;

 
 return 0;
}

  The Output Is:  


SAMPLE RUN # 1

Enter the value of n 5
log 2 : 0.783333

SAMPLE RUN # 2

Enter the value of n 10000
log 2 : 0.693091