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extern
//Title of this code //g++ 4.8.2 #include <iostream> int f(){extern int i;i++;std::cout<<i;}//if i is declared with no extern , then local instance of i , is going to be incremented so the output will be :1 //extern int i is a declaration , it is not reserving memory for variable i , the memory is reservet for it during definition of it , below int i=5; //there could be only 1 definition int i=5; and many declaration using extern ; int i=5; int main() { f(); }
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