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#include <stdio.h> static int internalVar = 20; void printInternalVar(){ printf("internalVar: %d\n", internalVar); } void modifyInternalVar(int value){ internalVar = value; } int main(){ printf("main_intermalVar: %d\n", internalVar); internalVar = 300; printf("main_intermalVar: %d\n", internalVar); return 0; }
#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(); modifyInternalVar(50); printInternalVar(); return 0; }*/

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