//Test For DLLs

#include <Windows.h>

/*
  Use this command to run

  gcc -shared 3.c -o calc.dll -Wl,--out-implib,libcalc.a

 */

#ifndef BUILD_DLL
#define API __declspec(dllexport)
#else
#define API __declspec(dllimport)
#endif

API int add(int a, int b){
    return a + b;
}
API int mul(int a, int b){
    return a * b;
}
API int sub(int a, int b){
    return a - b;
}
API int divd(int a, int b){
    if(b == 0) return -1;
    return a / b;
}

API int calc(int a, int b, char op){
    switch(op){
        case '+': return add(a, b);
        case '-': return sub(a, b);
        case '*': return mul(a, b);
        case '/': return divd(a, b);
    }
}