答案

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

#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; 
 
}