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#include <stdio.h>
// μΈλΆ νμΌμμ λ΄λΆ μ°κ²° λ³μλ₯Ό μ§μ μ°Έμ‘°ν μ μμ
// extern int internalVar; // μ΄λ κ² νλ©΄ λ§ν¬ μ€λ₯ λ°μ
extern void printInternalVar();
extern void modifyInternalVar(int value);
int main()
{
printInternalVar(); //internalVar: 20
modifyInternalVar(50);
printInternalVar(); //internalVar: 50
return 0;
}
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