Series 2

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(1 - 1/2 + 1/3 -......1/n)

#include<stdio.h>

#include<conio.h>

void main()

{

 int i,n;

 float s=0;

 clrscr();

 printf("Enter the value:");

 scanf("%d",&n);

 for(i=1;i<=n;i++)

 {

  if(i%2==0)

  s-=1/i;

  else

  s+=1/i;

 }

 printf("Sum is %d",s);

 getch();

}

OUTPUT:

Enter the value:4

0.50833333333