#include <stdio.h>
void printtest(int *p, int size);
int main(int argc, char* argv[]){
    int a[5]={10,20,30,40,50};
    int size=sizeof(a)/sizeof(a[0]); // size=(5*int_4byte)/4=5
    printtest(a, size/2);  // size/2=5/2=2, printtest(a, 2);
    return 0;
}
void printtest(int *p, int size){
    printf("%d \n", p[size]);  //p[2]=30 출력
}