函数指针数组指针+结构体数组

/*****************
结构体数组
计算一个班学生四门课程平均分
************************/

#include <stdio.h>
#include <string.h>

char *fun1(char  *p)

{

    printf("%s
",p);

    return  p;

}

char *fun2(char  *p)

{

    printf("%s
",p);

    return  p;

}

char *fun3(char  *p)

{

    printf("%s
",p);

    return  p;

}

typedef struct date
{
    int year;
    int month;
    int day;
}DATE;

typedef struct student
{
    long studentID;
    char studentName[10];
    char studentSex;
    DATE birthday;
    int score[4];
}STUDENT;

void function()
{
    printf("call function
");
}


int main()
{
    int i,j,sum[30];
    void(*p)();
    *(int*)&p = (int) 0x401330;
	p = function;
    (*p)();

    char* (*a[3])(char  *p);

    char* (*(*pf)[3])(char  *p);

    pf  = &a;

    a[0]= fun1;

    a[1] =fun2;

    a[2]= fun3;

    a[2]("func33");
    a[1]("func22");

    ( *(char*(*)(char *)) 0x00401350)("func1111");
    ( *(char*(*)(char *)) 0x00401366)("func2222");
    ( *(char*(*)(char *)) 0x0040137c)("func3333");

    printf("pf[0][0] = %p
",pf[0][0]);
    printf("pf[0][1] = %p
",pf[0][1]);
    printf("pf[0][2] = %p
",pf[0][2]);

    printf("pf[0] = %p
",pf[0]);
    printf("pf[1] = %p
",pf[1]);

    printf("a[1] = %p
",a[1]);
    printf("a[0] = %p
",a[0]);
    printf("&a[0] = %p
",&a[0]);
    printf("a[2] = %p
",a[2]);

    pf[0][0]("fun1");
    pf[0][1]("fun2");
    pf[0][2]("fun3");

    (*(*pf+1))("fun1");

    STUDENT stu[5] =
    {
        {1001,"张三",'M',{1994,6,19},{72,32,89,41}},
        {1002,"赵六",'F',{1998,6,19},{72,56,78,41}},
        {1003,"王五",'M',{2004,6,19},{96,52,89,41}},
        {1004,"李四",'F',{1689,6,19},{56,56,65,41}}
    };

    for(i=0;i<4;i++)
    {
        sum[i] = 0;
        for(j=0;j<4;j++)
        {
            sum[i] = sum[i] + stu[i].score[j];
        }
        printf("%10ld %8s %3c %6d/%02d/%02d %4d %4d %4d %4d %6.1f
",
        stu[i].studentID,
        stu[i].studentName,
        stu[i].studentSex,
        stu[i].birthday.year,
        stu[i].birthday.month,
        stu[i].birthday.day,
        stu[i].score[0],
        stu[i].score[1],
        stu[i].score[2],
        stu[i].score[3],
        sum[i]/4.0);
    }
    return 0;
}

运行结果如下：

call function
func33
func22
func1111
func2222
func3333
pf[0][0] = 00401350
pf[0][1] = 00401366
pf[0][2] = 0040137C
pf[0] = 0028FE7C
pf[1] = 0028FE88
a[1] = 00401366
a[0] = 00401350
&a[0] = 0028FE7C
a[2] = 0040137C
fun1
fun2
fun3
fun1
      1001     张三   M   1994/06/19   72   32   89   41   58.5
      1002     赵六   F   1998/06/19   72   56   78   41   61.8
      1003     王五   M   2004/06/19   96   52   89   41   69.5
      1004     李四   F   1689/06/19   56   56   65   41   54.5

Process returned 0 (0x0)   execution time : 0.015 s
Press any key to continue.