cpp-tutorial/scope.cpp at master · ycw66/cpp-tutorial · GitHub

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/*
* 变量的作用域
*/

#include<iostream>

int a = 1;
intfunc() {
int a = 2;

 std::cout << "1:" << a << std::endl;

return0;
}

/*

 scope of func: {a}

 scope of main: {a}
 scope2:
*/

intmain(){
int a = 3;

//
 {// scope2
// int a = 4;
 std::cout << "3" << '+' << a << std::endl;
 }

func();

 std::cout << "2:" << a << std::endl;

return0;
}