네이버 지식인 답변준것 c언어 구구단

# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# define _danSize_ 8
# define _numSize_ 9
 
typedef struct _gugudan {
    int dan[_danSize_];
    int num[_numSize_];
}gugudan;
 
// function prototype
void INI(gugudan** stu);
void INPUT(gugudan** stu);
void PRI(gugudan** stu);
void FREE(gugudan** stu);
 
int main(void) {
    gugudan* stu = NULL;
    INI(&stu);
    INPUT(&stu);
    PRI(&stu);
    FREE(&stu);
    printf(" addr (stu) ==> %p \n ", stu);
    return 0;
}
void INI(gugudan** stu) {
    (*stu) = (gugudan*)malloc(sizeof(gugudan));
    memset((*stu), 0, sizeof(gugudan));
} // end of [INI] function
 
void INPUT(gugudan** stu) {
    int i, j; // index
 
    // 단 : 2 ~ 9
    for ( i = 0; i < _danSize_ ; i++ ) {
           (** stu).dan[i] = i + 2 ;
    }
    
    // 
    for ( j = 0; j < _numSize_ ; j++ ) {
        (** stu).num[j] = j + 1 ;
    }
} // end of [INPUT] function
 
void PRI(gugudan** stu) {
    // 2 3 4 5
    // 6 7 8 9
    int i, j;
    for ( i = 0 ; i < _numSize_ ; i ++ ) {
        for ( j = 0 ; j < 4 ; j ++ ) {
            printf( "%2d x %2d = %2d  ", (**stu).dan[j], (**stu).num[i], (**stu).dan[j] * (**stu).num[i]);
        }
        printf("\n");
    }
    printf("\n");
 
    for ( i = 0 ; i < _numSize_ ; i ++ ) {
        for ( j = 4 ; j < _danSize_ ; j ++ ) {
            printf( "%2d x %2d = %2d  ", (**stu).dan[j], (**stu).num[i], (**stu).dan[j] * (**stu).num[i]);
        }
        printf("\n");
    }
    printf("\n");
} // end of [PRI] function
 
void FREE(gugudan** stu) {
    gugudan* remo = (* stu);
    (* stu) = NULL;
    free(remo);
} // end of [FREE] function