#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct
{
    int a;
    int b;
} DOUBLE_INT, *Double_int;

Double_int a[4];

int main()
{
    int i;
   
    for ( i=0; i < 4; i++)
    {
        a[i]->a = (i+1);
        
        a[i]->b = (i+1)<<1;

}
   
    for ( i=0; i < 4; i++)
        
    {
        if (a[i]-> a & 1)
            
            printf("a is Odd : a.a = %d a.b = %d\n",a[i]->a,a[i]->b);
        
        else
            
            printf("a is even: a.a = %d a.b = %d\n",a[i]->a,a[i]->b);
    }
    return 0;
}

#include <stdio.h>

typedef struct {
    int a;
    int b;
} DOUBLE_INT;

DOUBLE_INT a[4];

int main(void) {
    int i;

    for(i = 0; i < 4; i++) {
        a[i].a = (i + 1);
        a[i].b = (i + 1) << 1;
    }

    for(i = 0; i < 4; i++) {
        if(a[i].a & 1)
            printf("a[%d].a 为奇数: a[%d].a = %d a[%d].b = %d\n", i, i, a[i].a, i, a[i].b);

        else
            printf("a[%d].a 为偶数: a[%d].a = %d a[%d].b = %d\n", i, i, a[i].a, i, a[i].b);
    }

    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#define FREE(res) if(res) free(res), res = NULL

typedef struct {
    int x;
    int y;
} DINT, *PDINT;

int main(void) {
    int i;
    DINT a[4];
    PDINT b[4];

    for(i = 0; i < 4; i++) {
        a[i].x = i + 1;
        a[i].y = (i + 1) << 1;

        if(a[i].x & 1) printf("x is Odd : a.x = %d a.y = %d\n", a[i].x, a[i].y);

        else printf("x is even: a.y = %d a.y = %d\n", a[i].x, a[i].y);
    }

    printf("\n");

    for(i = 0; i < 4; i++) {
        b[i] = malloc(sizeof(PDINT));

        if(b[i] == NULL) {
            printf("MALLOC ERROR!\n");
            exit(1);
        }

        b[i]->x = i + 1;
        b[i]->y = (i + 1) << 1;

        if(b[i]->x & 1) printf("x is Odd : b.x = %d b.y = %d\n", b[i]->x, b[i]->y);

        else printf("x is even: b.y = %d b.y = %d\n", b[i]->x, b[i]->y);

        FREE(b[i]);
    }

    return 0;
}

[ 本帖最后由 longwu9t 于 2015-2-25 14:32 编辑 ]