-1
/* Example in unions */
#include <stdio.h> // standard header file
#include <ctype.h> // for atoi function
#include <stdlib.h> // for malloc function
#include <assert.h> // for assert macro
#define MAX 512 // for fgets()
typedef enum {National, Alien} PERSON_KIND;
typedef struct date {
int month;
int day;
int year;
} DATE;
typedef struct {
char countryOfOrigin[30];
DATE * dateOfEntry; // so you get comfortable with pointers
enum { Worker, Tourist, Student} visaStatus;
char portOfEntry[30];
} ALIEN;
typedef struct {
char placeOfBirth[30];
char ssn[20];
} CITIZEN;
typedef union {
ALIEN alien;
CITIZEN citizen;
} PERSON_INFO;
typedef struct person {
char name[30];
DATE * dateOfBirth; // just to make it interesting
PERSON_KIND personKind;
PERSON_INFO info;
} PERSON;
void fillInfo(PERSON *);
void printInfo(const PERSON *);
int main() {
printf("sizeof(int) is %u\n", (unsigned) sizeof(int));
printf("sizeof(PERSON_KIND) is %u\n", (unsigned) sizeof(PERSON_KIND));
printf("sizeof(DATE) is %u\n", (unsigned) sizeof(DATE));
printf("sizeof(ALIEN) is %u\n", (unsigned) sizeof(ALIEN));
printf("sizeof(CITIZEN) is %u\n", (unsigned) sizeof(CITIZEN));
printf("sizeof(PERSON_INFO) is %u\n", (unsigned) sizeof(PERSON_INFO));
printf("sizeof(PERSON) is %u\n", (unsigned) sizeof(PERSON));
/* fillInfo(&p1);
printf("\nThe infomation you entered is given below:\n");
printInfo(&p1);
fillInfo(&p2);
printf("\nThe infomation you entered is given below:\n");
printInfo(&p2); */
return 0;
}
/* void fillInfo(PERSON *p) {
char buf[MAX], i;
printf("Please enter the person's name: ");
printf("Please enter the birth month: ");
printf("Please enter the birth date: ");
printf("Please enter the birth year: ");
printf("Please enter 1 if the person is a National or 2\n");
printf("if the person is an alien: ");
// get the value from the user and store it as an integer in i
if (i == 1) p -> personKind = National;
else p -> personKind = Alien;
if (p -> personKind == National) {
printf("Please enter the place of birth: ");
printf("Please enter the ssn: ");
}
if (p -> personKind == Alien) {
printf("Please enter the country of origin: ");
printf("Please enter the month the person entered this country: ");
printf("Please enter the day of the month the person entered this country: ");
printf("Please enter the year the person entered this country: ");
printf("Please enter the person's immigration status : \n");
printf("\t1 for Worker:\n");
printf("\t2 for Tourist:\n");
printf("\t3 for Student: \n");
fgets(buf, MAX, stdin);
i = atoi(buf);
switch (i) {
case 1 :
p -> info.alien.visaStatus = Worker;
break;
case 2 :
p -> info.alien.visaStatus = Tourist;
break;
case 3 :
p -> info.alien.visaStatus = Student;
}
printf("Please enter the port of entry: ");
}
}
void printInfo(const PERSON *p) {
printf("Name: %s\n", p -> name);
printf("Date of Birth: %2d/%2d/%4d\n",);
printf("Status: ");
if (p -> personKind == National) printf("National\n");
else printf("Alien\n");
if (p -> personKind == National) {
printf("Place of birth: %s\n",);
printf("SSN: %s\n",);
}
if (p -> personKind == Alien) {
printf("Country of origin: %s\n",);
printf("Date of Entry: %2d/%2d/%4d\n", );
printf("Immigration status: ");
switch (p -> info.alien.visaStatus) {
case Worker :
printf("Worker\n");
break;
case Tourist :
printf("Tourist\n");
break;
case Student :
printf("Student\n");
}
printf("Port of Entry: %s\n\n",);
}
} // print_info */
예상 출력 : 모든 주석 코드가 주석입니다예
sizeof(int) is 4
sizeof(PERSON_KIND) is 4
sizeof(DATE) is 12
sizeof(ALIEN) is 80
sizeof(CITIZEN) is 50
sizeof(PERSON_INFO) is 80
sizeof(PERSON) is 128
Please enter the person's name: John Doe
Please enter the birth month: 10
Please enter the birth date: 31
Please enter the birth year: 1989
Please enter 1 if the person is a National or 2
if the person is an alien: 1
Please enter the place of birth: Worcester
Please enter the ssn:
The infomation you entered is given below:
Name: John Doe
Date of Birth: 10/31/1989
Status: National
Place of birth: Worcester
SSN:
Please enter the person's name: Jane Smith
Please enter the birth month: 2
Please enter the birth date: 20
Please enter the birth year: 1970
Please enter 1 if the person is a National or 2
if the person is an alien: 2
Please enter the country of origin: Libya
Please enter the month the person entered this country: 10
Please enter the day of the month the person entered this country: 23
Please enter the year the person entered this country: 2009
Please enter the person's immigration status :
1 for Worker:
2 for Tourist:
3 for Student:
1
Please enter the port of entry: New York
The infomation you entered is given below:
Name: Jane Smith
Date of Birth: 2/20/1970
Status: Alien
Country of origin: Libya
Date of Entry: 10/23/2009
Immigration status: Worker
Port of Entry: New York
컴파일러 오류 : 만 이대로가 ... 노동 조합에 익숙하지 않은 오전
Example_union.c: In function ‘main’:
Example_union.c:56:12: error: ‘p1’ undeclared (first use in this function)
Example_union.c:56:12: note: each undeclared identifier is reported only once for each function it appears in
Example_union.c:60:12: error: ‘p2’ undeclared (first use in this function)
Example_union.c:62:20: error: expected expression before ‘/’ token
Example_union.c: In function ‘printInfo’:
Example_union.c:132:41: error: expected expression before ‘)’ token
Example_union.c:139:34: error: expected expression before ‘)’ token
Example_union.c:140:23: error: expected expression before ‘)’ token
Example_union.c:144:37: error: expected expression before ‘)’ token
Example_union.c:146:43: error: expected expression before ‘)’ token
Example_union.c:160:35: error: expected expression before ‘)’ token
Example_union.c:65:1: warning: control reaches end of non-void function [-Wreturn-type]
구조에 익숙하다. 위의 코드에서 올바른 결과를 내기 위해 코드/유니온 예제를 어떻게 끝낼 수 있을지 궁금합니다. 아직 완성되지 않은 코드의 현재 컴파일러 오류가 있습니다. 내가 절박한 필요가있을 때 도와 주길 바래. 감사.
어디'p1' ??? 나를 찾아라! – gongzhitaao
구조체에 익숙하지만 식별자를 사용하기 전에 식별자를 선언하지 않는다고 생각하십니까? – Kaz
그게 요점이야 ... 완료해야합니다 –