Vu Student Helping Zone

For Date Sheet Click on Link http://datesheet.vu.edu.pk/login.aspx

#include<iostream> #include<stdlib.h> using namespace std; main() {  int upperlimit, lowerlimit, sum=0;  cout<<"please enter lower limit (Greater > 0 ) = ";   cin>>lowerlimit;    if (lowerlimit>0)   {    cout<<"please enter upper limit (Greater > lower limit) = ";     cin>>upperlimit;     if (upperlimit>lowerlimit)  {     for(int i=lowerlimit; i<=upperlimit; i++) {     if(i%4==0)  {                     sum=sum-i; } else {  sum=sum+i; }   }   cout<<"calculated number is = "<<sum<<endl; } else { cout<<"lower limit should be (greater > 0) "; }   system("pause"); } }