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#include <iostream>
using namespace std;
 
int main()
{
    int32_t a,b;
    char c;
    while (cin>>c>>a>>b)
    {
        switch (c)
        {
        case '+':
            cout<<a+b<<endl;
            break;
        case '-':
            cout<<a-b<<endl;
            break;
        case '*':
            cout<<a*b<<endl;
            break;
        case '/':
            {
                if (b!=0)
                cout<<a/b<<endl;
            }
            break;
        case '%':
            cout<<a%b<<endl;
            break;
        }
    }
 
 
    return 0;
}
 

prog.cpp: In function 'int main()':
prog.cpp:6:5: error: 'int32_t' was not declared in this scope
     int32_t a,b;
     ^
prog.cpp:8:20: error: 'a' was not declared in this scope
     while (cin>>c>>a>>b)
                    ^
prog.cpp:8:23: error: 'b' was not declared in this scope
     while (cin>>c>>a>>b)
                       ^

Standard output is empty