#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 a=1,b=10,c; c=sum(a,b); cout<<c<<endl; a=20,b=30; c=sum(a,b); cout<<c<<endl; a=35,b=45; c=sum(a,b); cout<<c<<endl; }