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