struct

#include <stdio.h>
#include <stdlib.h>

struct _AAA
{
    int age;
};

typedef struct BBB
{
    int age;
};

typedef struct  
{
    int age;
} CCC;


int main()
{
    _AAA humanA;
    humanA.age = 10;
    BBB humanB;
    humanB.age = 10;
    CCC humanC;
    humanC.age = 10;
    return 0;
}

AAA는  C++에서만 가능

typedef struct{ 
    int a;
    char b;
    short d;
    int c;
}structTest; 

printf("Struct Size : %d\n",sizeof(sTemp)); 

Struct Size : 12

typedef struct{ 
    int a;
    char b;
    int c;
    short d;
}structTest; 

printf("Struct Size : %d\n",sizeof(sTemp)); 

Struct Size : 16