error: 'n' cannot be used as a function| || c++

[akashranjan]

#include<bits/stdc++.h>
using namespace std;

int main()
{
int n,sum;
cout<<"enter the number to find the sum upto that :";
cin>>n;

sum=n(n+1)/2;

cout<<"the sum of all natural number upto "<<n<<"is :"<<sum;

}


How to resolve Error I'm getting below:


|error: 'n' cannot be used as a function|
||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

[dev7060]

#include<bits/stdc++.h>
using namespace std;

int main()
{
int n,sum;
cout<<"enter the number to find the sum upto that :";
cin>>n;

sum=n(n+1)/2;

cout<<"the sum of all natural number upto "<<n<<"is :"<<sum;

}

How to resolve Error I'm getting below:


|error: 'n' cannot be used as a function|
||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

Probably meant to be this

sum=n*(n+1)/2;