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#include <stdio.h> // 외부 파일에서 내부 연결 변수를 직접 참조할 수 없음 // extern int internalVar; // 이렇게 하면 링크 오류 발생 extern void printInternalVar(); extern void modifyInternalVar(int value); int main() { printInternalVar(); //internalVar: 20 modifyInternalVar(50); printInternalVar(); //internalVar: 50 return 0; }

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