C语言结构体全通详解

#include <stdio.h>#include <stdlib.h>struct student{int num;char *tel;int *can;};struct test_pfun {int id;char name[10];int *age;struct student stu;struct student *pstu;int (*add) (int a,int b);int (*sub) (int a,int b);int (*mult) (int a,int b);};static int  test_add(int a,int b){  return (a+b);}static int  test_sub(int a,int b){  return (a-b);}static int   test_mult(int a,int b){  return (a*b);}void print_uage(char *p){printf("%s <num1> <num2>\n ",p);}int cnt ,cnt1;struct student zhang = {.num = 2013,.tel    ="114",.can  = &cnt,};struct student zhang1 = {.num = 2014,.tel    ="120",.can  = &cnt1,}; int main(int argc,char **argv){int a ,b; struct test_pfun google[] = {[0] = {                        /* [0] is omissible */google[0].id = 10,         /* google[0] is omissible */.name = "google",.sub   =test_sub,.mult  =test_mult,.age = &b,.pstu    = &zhang,.stu={.num = 258,.tel   =  "110",},},{.id = 11,.name = "linux",.age = &a,.add   =test_add,.pstu    = &zhang1,.stu ={.num = 256,.tel = "119",},},} ;if(argc!=3){print_uage(argv[0]);return -1;}a=strtoul(argv[1],NULL,0);b=strtoul(argv[2],NULL,0);printf("a = %d b= %d \n",a,b);printf("a+b=%d\n",google[1].add(a,b));printf("a-b=%d\n",google[0].sub(a,b));printf("a*b=%d\n",google[0].mult(a,b));printf("google[0].id  = %d google[1].id  = %d\n",google[0].id ,google[1].id );printf("google[0].age = %d google[1].age = %d\n",*google[0].age ,*google[1].age);printf("google[0].name = %s google[1].name = %s\n",google[0].name ,google[1].name);printf("google[0].stu.num = %d google[0].stu.tel =%s\n",google[0].stu.num,google[0].stu.tel);printf("google[1].stu.num = %d google[1].stu.tel =%s\n",google[1].stu.num,google[1].stu.tel);printf("google[0].pstu->num = %d google[0].pstu->tel =%s  google[0].pstu->can =%d\n",google[0].pstu->num,google[0].pstu->tel,*google[0].pstu->can);printf("google[1].pstu->num = %d google[1].pstu->tel =%s  google[1].pstu->can =%d\n ",google[1].pstu->num,google[1].pstu->tel,*google[0].pstu->can);return 0;}