[C] 구조체 포인터, 구조체 배열 포인터. malloc을 이용한 구조체 (배열) 공간 할당받기

구조체 포인터, 구조체 배열 포인터. malloc을 이용한 구조체 (배열) 공간 할당받기

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

typedef struct _employee

{

    char name[10];

    int  age;

    char company[20];

}employee;

int main (void)

{

    employee *em_p;

    em_p = (employee*)malloc(sizeof(employee)*3);

    //마지막에 *3이것만하면 배열되는거임?!! (ㅇㅇ)

    int i;

    for (i=0; i<3; i++)

    {

    printf("Input [%d]st employee's information\n", i+1);

    printf("name:");

    scanf("%s", em_p[i].name);

    printf("age:");

    scanf("%d", &em_p[i].age);

    printf("company:");

    scanf("%s", em_p[i].company);    

    }

    //sorting

    int j;

    char temp_name[10];

    int  temp_age;

    char temp_company[20];

    for ( i=0; i<3; i++)

   {   

       for ( j=0; j<3-(i+1); j++)

        {   

            if (strcmp(em_p[j].name, em_p[j+1].name) > 0 )

            {   

                strcpy (temp_name, em_p[j].name);

                temp_age =  em_p[j].age;

                strcpy (temp_company, em_p[j].company);

                strcpy (em_p[j].name, em_p[j+1].name);

                em_p[j].age = em_p[j+1].age;

                strcpy (em_p[j].company, em_p[j+1].company);

    

                strcpy (em_p[j+1].name, temp_name);

                em_p[j+1].age = temp_age;

                strcpy (em_p[j+1].company, temp_company);

             }   

        }   

    }   

    for (i=0; i<3; i++)

    {

    printf("\n====%dst employee's information ====\n", i+1);

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

    printf("age:%d\n", em_p[i].age);

    printf("company:%s\n", em_p[i].company);

    }

    return 0;