write a program to compile the sum of the first n terms of the following series s=1-2+3-4+5-6.....

 //write a program to compile the sum of the first n terms of the following series s=1-2+3-4+5-6.....

#include <stdio.h>

int main()

{

int n;

int sum=0,i;

printf("Enter the range of number.");

scanf("%d",&n);


for(i=1;i<=n;i++)

{

if(i%2==0)

sum-=i;

else

sum+=i;

}

printf("The sum of the series=%d",sum);

}

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