Introduction to C + + Classic-Example 4.9-output variable values for different life cycles

1: The code is as follows:

//4.9.cpp: Defines the entry point of the console application. //#include"stdafx.h"#include<iostream>using namespacestd;voidMain () {intI,j,k;//The life cycle of this k is the entire main functioncout <<"input the number:"<<Endl; CIN>> I >>J; K=i+J; if(i!=0&& j!=0 )    {        intK//The life cycle of this k is only within this if statementk=i-J; cout<<"K:"<< k << Endl;//the value of the output variable K} cout<<"K:"<<k << Endl;//the value of the output variable K}

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Introduction to C + + Classic-Example 4.9-output variable values for different life cycles