One-line Calculator 2 in C++

#include <iostream>
using namespace std;
int main()
{
    float n , m ;
    char s ;
    cin>>n >>s >>m;
    cout<<" = ";
    if(s=='+')
    {
        cout<<n+m;
    }
    else if(s=='-')
    {
        cout<<n-m;
    }
    else if(s=='*')
    {
        cout<<n*m;
    }
    else if(s=='/')
    {
        cout<<n/m;
    }
}