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\n",p);

return p;

}

char *fun2(char *p)

{

printf("%s\n",p);

return p;

}

char *fun3(char *p)

{

printf("%s\n",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\n");
}


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

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

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

　　输出：

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.