Answer to Question #17547 in C++ for islam saad

Question

i need the answer for this equation ..thanks S=1-2+3-4+5... +-n

Answer 1

void f(int n)
{
intsum = 0 ;
for(int i = 1; i < n; i++){
if(i%2 != 0) {
sum+= i;
}else sum-=i;
}
cout<< sum << endl;
}