쉽게 풀어 쓴 C언어 Express 13장 프로그래밍 문제 해설

쉽게 풀어 쓴 C언어 Express 13장 프로그래밍 문제 해설

쉽게 풀어 쓴 C언어 Express 13장 프로그래밍 문제 해설

1.

(a)

#include <stdio.h>

struct point {

int x, y;

}

;

int equal(struct point p1, struct point p2);

int main(void) {

struct point p1= {

1, 2

}

;

struct point p2= {

3, 5

}

;

printf("일치 여부 = %d\n", equal(p1, p2));

return 0;

}

int equal(struct point p1, struct point p2) {

if( p1.x == p2.x && p1.y == p2.y ) return 1; else return 0;

}

(b)

삶의 동기가 부족하다면 배달알바 해봐라

#include <stdio.h>

struct point {

int x, y;

}

;

int quadrant(struct point p);

int main(void) {

struct point p= {

-1, 2

}

;

printf("사분면 = %d\n", quadrant(p));

return 0;

}

int quadrant(struct point p) {

if( p.x > 0 && p.y > 0 ) return 1; else if( p.x < 0 && p.y > 0 ) return 2; else if( p.x < 0 && p.y < 0 ) return 3; else return 4;

}

2.

(a)

#include <stdio.h>

struct point {

int x, y;

}

;

int equal(struct point *p1, struct point *p2);

int main(void) {

struct point p1= {

1, 2

}

;

struct point p2= {

3, 5

}

;

printf("일치 여부 = %d\n", equal(&p1, &p2));

return 0;

}

int equal(struct point *p1, struct point *p2) {

if( p1->x == p2->x && p1->y == p2->y ) return 1; else return 0;

}

(b)

스포츠카를 못타는 인생은 진짜 불쌍한 인생이다

#include <stdio.h>

struct point {

int x, y;

}

;

int quadrant(struct point *p);

int main(void) {

struct point p= {

-1, 2

}

;

printf("사분면 = %d\n", quadrant(&p));

return 0;

}

int quadrant(struct point *p) {

if( p->x > 0 && p->y > 0 ) return 1; else if( p->x < 0 && p->y > 0 ) return 2; else if( p->x < 0 && p->y < 0 ) return 3; else return 4;

}

3.

#include <stdio.h>

#include <math.h>

struct point {

int x, y;

}

;

struct rectangle {

struct point a, b;

// a는 오른쪽 상단, b는 왼쪽 하단을 나타낸다.

}

;

int area(struct rectangle r);

int perimeter(struct rectangle r);

int is_square(struct rectangle r);

int main(void) {

struct point p1= {

1, 1

}

;

struct point p2= {

2, 2

}

;

struct rectangle r;

r.a = p1;

r.b = p2;

printf("%d\n", area(r));

printf("%d\n", perimeter(r));

printf("%d\n", is_square(r));

return 0;

}

int area(struct rectangle r) {

return abs(r.a.x-r.b.x)*abs(r.a.y-r.b.y);

}

int perimeter(struct rectangle r) {

return 2*(abs(r.a.x-r.b.x)+abs(r.a.y-r.b.y));

}

int is_square(struct rectangle r) {

return abs(r.a.x-r.b.x)==abs(r.a.y-r.b.y);

}

4.

#include <stdio.h>

struct complex {

double real;

double imag;

}

;

struct complex add(struct complex c1, struct complex c2) {

struct complex result;

result.real = c1.real+c2.real;

result.imag = c1.imag+c2.imag;

return result;

}

struct complex sub(struct complex c1, struct complex c2) {

struct complex result;

result.real = c1.real+c2.real;

result.imag = c1.imag+c2.imag;

return result;

}

struct complex mul(struct complex c1, struct complex c2) {

struct complex result;

result.real = c1.real*c2.real-c1.imag*c2.imag;

result.imag = c1.real*c2.imag+c1.imag*c2.real;

return result;

}

void print(struct complex c) {

printf("%f+%fi\n", c.real,c.imag);

}

int main(void) {

struct complex c1= {

1.0, 2.0

}

;

struct complex c2= {

2.0, 3.0

}

;

struct complex c3;

c3= add(c1, c2);

print(c3);

return 1;

}

순자산 8.4억이면 상위 10%.JPG

 

5.

#include <stdio.h>

#include <math.h>

struct vector {

double x;

double y;

}

;

struct vector vector_add(struct vector v1, struct vector v2) {

struct vector r;

r.x = v1.x + v2.x;

r.y = v1.y + v2.y;

return r;

}

void vector_print(struct vector v) {

printf("(%f, %f)\n", v.x, v.y);

}

int main(void) {

struct vector v1= {

1.0, 2.0

}

;

struct vector v2= {

2.0, 3.0

}

;

struct vector v3;

v3 = vector_add(v1, v2);

vector_print(v3);

return 0;

}

6.

#include <stdio.h>

#include <string.h>

struct email {

char title[100];

char receiver[50];

char sender[50];

char content[1000];

char date[100];

int priority;

}

;

int main(void) {

struct email e;

strcpy(e.title, "안부 메일");

strcpy(e.receiver, "chulsoo@hankuk.ac.kr");

strcpy(e.sender, "hsh@hankuk.ac.kr");

strcpy(e.content, "안녕하십니까? 별일 없으신지요?");

strcpy(e.date, "2010/9/1");

e.priority = 1;

return 0;

}

주식하면 집안 망한다.

 

7.

#include <stdio.h>

#include <math.h>

struct food {

char name[100];

int calories;

}

;

int calc_total_calroies(struct food array[], int size);

int main(void) {

struct food food_array[3]= { {

"hambuger", 900

}

, {

"bulgogi", 500

}

, {

"sushi", 700

}

}

;

int total = calc_total_calroies(food_array, 3);

printf("%d\n", total);

return 0;

}

int calc_total_calroies(struct food array[], int size) {

int i, total=0;

for (i=0;i<size;i++) {

total += array[i].calories;

}

return total;

}

8.

#include <stdio.h>

#include <string.h>

// 직원

struct employee {

int number;

// 사번

char name[20];

// 이름

int age;

// 나이

char tel[20];

// 전화번호

}

;

int main(void) {

struct employee e[10] = { {

1, "홍길동1", 20, "111-1111"

}

, {

2, "홍길동2", 25, "111-1112"

}

, {

3, "홍길동3", 60, "111-1113"

}

, {

4, "홍길동4", 40, "111-1114"

}

, {

5, "홍길동5", 50, "111-1115"

}

, {

6, "홍길동6", 45, "111-1116"

}

, {

7, "홍길동7", 32, "111-1117"

}

, {

8, "홍길동8", 23, "111-1118"

}

, {

9, "홍길동9", 29, "111-1119"

}

, {

10, "홍길동10", 62, "111-1120"

}

}

;

int i;

for (i=0;i<10;i++)

if( e[i].age >= 20 && e[i].age <= 30 )

printf("%s\n", e[i].name);

return 0;

}

9.

#include <stdio.h>

#include <math.h>

struct contact {

char name[100];

char home_phone[100];

char cell_phone[100];

}

;

int main(void) {

struct contact list[5];

int i;

char name[100];

for (i=0;i<5;i++) {

printf("이름을 입력하시오:");

scanf("%s", list[i].name);

printf("집전화번호를 입력하시오:");

scanf("%s", list[i].home_phone);

printf("휴대폰번호를 입력하시오:");

scanf("%s", list[i].cell_phone);

}

printf("검색할 이름을 입력하시오:");

scanf("%s", name);

for (i=0;i<5;i++) {

if( strcmp(name, list[i].name)==0 ) {

printf("집전화번호: %s\n", list[i].home_phone);

printf("휴대폰번호: %s\n", list[i].cell_phone);

return 0;

}

}

printf("검색이 실패하였슴\n");

return 0;

}

내 생각엔 1기 신도시가 투자 가치 있을 거 같음

 

10.

#include <stdio.h>

#include <math.h>

struct card {

int value;

char suit;

}

;

int main(void) {

struct card cards[52];

int i;

for (i=0;i<13;i++) {

cards[i].value=i%13+1;

cards[i].suit='c';

}

for (i=0;i<13;i++) {

cards[i+13].value=i%13+1;

cards[i+13].suit='d';

}

for (i=0;i<13;i++) {

cards[i+26].value=i%13+1;

cards[i+26].suit='h';

}

for (i=0;i<13;i++) {

cards[i+39].value=i%13+1;

cards[i+39].suit='s';

}

for (i=0;i<52;i++) {

printf("%d:%c ", cards[i].value, cards[i].suit);

}

return 0;

}

15.

#include <stdio.h>

#include <math.h>

enum shape_type {

TRIANGLE, RECTANGLE, CIRCLE

}

;

struct shape {

int type;

union {

struct {

int base, height;

}

tri;

struct {

int width, height;

}

rect;

struct {

int radius;

}

circ;

}

p;

}

;

int main(void) {

struct shape s;

enum shpae_type type;

printf("도형의 타입을 입력하시오(0, 1, 2): ");

scanf("%d", &type);

switch(type) {

case TRIANGLE:

printf("밑변과 반지름을 입력하시오(예를 들어서 100 200): ");

scanf("%d %d", &s.p.tri.base, &s.p.tri.height);

printf("면적은 %d\n", (int)(0.5*s.p.tri.base*s.p.tri.height));

break;

case RECTANGLE:

printf("가로와 세로의 길이를 입력하시오(예를 들어서 100 200):");

scanf("%d %d", &s.p.rect.width, &s.p.rect.height);

printf("면적은 %d\n", (int)(s.p.rect.width*s.p.rect.height));

break;

case CIRCLE:

printf("반지름을 입력하시오(예를 들어서 100): ");

scanf("%d", &s.p.circ.radius);

printf("면적은 %d\n", (int)(3.14*s.p.circ.radius*s.p.circ.radius));

break;

}

return 0;

}

18.

#include <stdio.h>

#include <string.h>

#define TITLE_SIZE 50

#define NAME_SIZE 50

#define LOCATION_SIZE 50

enum music_type {

KPOP, POP, CLASSIC, SCREEN_MUSIC

}

;

typedef struct music {

char title[TITLE_SIZE];

char singer[NAME_SIZE];

char location[LOCATION_SIZE];

enum music_type genre;

}

MUSIC;

void add_record(MUSIC library[], int count);

void menu();

int get_input();

void search_record(MUSIC library[], int count);

void print_record(MUSIC library[], int count);

int main(void) {

int num, count = 0;

MUSIC library[30] = {

'\0'

}

;

while(1) {

menu();

num = get_input();

switch(num) {

case 1:

add_record(library, count);

count++;

continue;

case 2:

print_record(library, count);

continue;

case 3:

search_record(library, count);

continue;

case 4:

return -1;

}

return 0;

}

}

void add_record(MUSIC library[], int count) {

int type;

fflush(stdin);

printf("제목:");

gets(library[count].title);

printf("가수:");

gets(library[count].singer);

printf("위치:");

gets(library[count].location);

printf("장르(0: 가요, 1: 팝, 2: 클래식, 3: 영화음악)");

scanf("%d",&type);

if(type >= KPOP && type <= SCREEN_MUSIC)

library[count].genre = type; else

library[count].genre = KPOP;

}

void menu() {

printf("====================\n");

printf(" 1. 추가\n");

printf(" 2. 출력\n");

printf(" 3. 검색\n");

printf(" 4. 종료\n");

printf("====================\n");

}

int get_input() {

int num;

printf("정수값을 입력하시오 : ");

scanf("%d",&num);

return num;

}

void search_record(MUSIC library[], int count) {

int i;

char title[TITLE_SIZE];

fflush(stdin);

printf("제목: ");

gets(title);

for (i = 0; i < count; i++) {

if(strcmp(title,library[i].title) == 0) {

printf("저장된 위치는 %s\n",library[i].location);

return;

}

}

printf("찾는 음악이 테이블에 없습니다.\n");

}

void print_record(MUSIC library[], int count) {

int i;

fflush(stdin);

for (i = 0; i < count; i++) {

printf("제목 : %s\n",library[i].title);

printf("가수 : %s\n",library[i].singer);

printf("위치 : %s\n",library[i].location);

if(library[i].genre == 0)

printf("장르 : 가요\n"); else if(library[i].genre == 1)

printf("장르 : 팝\n"); else if(library[i].genre == 2)

printf("장르 : 클래식\n"); else if(library[i].genre == 3)

printf("장르 : 영화음악\n");

}

}

반박환영) 우리나라에서 살만한 동네 최종 6곳