#include<iostream> using namespace std; int sum(int a,int b){ int s=0; for(int i=a;i<=b;i++){ s+=i; } return s; } int sum(int a,int b,int c); int main(){ cout<<sum(1,10)<<endl; cout<<sum(20,30)<<endl; cout<<sum(35,45)<<endl; return 0; }