#include<iostream> using namespace std; int sum (int n,int m) { int sum=0; for (int i=n;i<=m;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; }