C언어 Union과 Enum

#include <stdio.h>

typedef enum _GradeType { TYPE_GRADE, TYPE_SCORE} GradeType;

typedef struct _my_score

{

GradeType type;

union

{

char grade;

int score;

} result;

} my_score;

int main()

{

int grade_type = TYPE_GRADE;

my_score s1 = {0};

printf("GradeType input : ( 0 : Grade, 1 : Score)?");

scanf("%d", &grade_type);

switch (grade_type){

case TYPE_GRADE:

{

char temp[10] = {0};

printf("input Grade ( A ~ F )");

scanf("%s", temp);

s1.result.grade = temp[0];

break;

}

case TYPE_SCORE:

printf("input Score ( 0 ~ 100 )");

scanf("%d", &s1.result.score);

break;

default:

printf("Wrong Type");

break;

}

switch (grade_type){

case TYPE_GRADE:

printf("Grade : %c", s1.result.grade);

break;

case TYPE_SCORE:

printf("Score : %d", s1.result.score);

break;

default:

break;

}

return 0;

}

> Executing task: ./union_and_enum.exe <

GradeType input : ( 0 : Grade, 1 : Score)?0
input Grade ( A ~ F )B
Grade : B
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> Executing task: ./union_and_enum.exe <

GradeType input : ( 0 : Grade, 1 : Score)?1
input Score ( 0 ~ 100 )95
Score : 95