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