#include<bits/stdc++.h> using namespace std; int main(){ float a,b; char optr; cin>>a>>b>>optr; switch(optr){ case '+': cout<<a+b; break; case '-': cout<<a-b; break; case '': cout<<ab; break; case '/': if(b==0){ cout<<"Divided by zero!"; } else{ cout<<a/b; } break; default: cout<<"Invalid operator!"; break; } return 0; }
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float a, b; 用 int