#include <bits/stdc++.h> using namespace std; int sum(int x,int y) { int sum=0; for(int i=x;i<=y;i++) { sum+=i; } return sum; } int main() { int c; c=sum(1,10); cout<<c<<endl; c=sum(20,30); cout<<c<<endl; c=sum(35,45); cout<<c<<endl; return 0; }