c++求助

结果显示编译错误，求大神找出错误

#include<bits/stdc++.h>
using naamespace std;
int main(){
    int a,b;
    char c;
    cin>>a>>b;
    cin>>c;
    if(b==0&&c=='/'){
        cout<<"Divided by zero!"<<endl;
        return 0;
    }
    if(c=='+')
        cout<<a+b<<endl;
    else if(c=='-')
        cout<<a-b<<endl;
    else if(c=='*')
        cout<<a*b<<endl;
    else if(c=='/'){
        if(b==0){
        cout<<"Divided by zero!"<<endl;
        return 0;
        }
        cout<<a/b<<endl; 
    }
    else
        cout<<"Invalid operator!"<<endl;
    return 0;
}