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Self doubt

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“An Extern variable will be initialized to 0 if not initialized” is this statement correct? If yes then How it can initialize because when we write “ extern int a ” it will not create any memory. So how it can store some value? please explain in detail?
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Hira Thakur asked Dec 12, 2021
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self doubt
consider temp=1; temp+=temp*temp<<2+3; printf(“%d”,temp); // this line will print output as $33$ how?? Line number 2 can be written as: temp=temp+temp*temp<<2+3; my doubt is: *>+>» is the order of execution according to precedence rule; now temp= 1+1*1<<2+3; temp=1+1<<2+3 how $33$ will come?? please someone explain this??
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