For interest s sake we can follow execution into the wib function to see the divide error again by issuing the step command as opposed to next which steps over function calls followed by a next to get to the " result " calculation 如果有兴趣，可以使用step命令（与next形成对比， next将跳过函数调用）来继续执行wib ( )函数，以再次查看除法错误，然后使用next来计算" result " 。
