struct and union example

1. StructHandler.c:

/*
* StructHandler.c
*
* Created on: Jul 6, 2013
* Author: wangle
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void modifyName(struct student *p);

int main(){
   struct student{
       char name[50];
       char dep[50];
       long no;
       float score[4];
   };

typedef struct student stu_t;

struct student stu[50]={
       "wangle", "Math", 80,80,90.5,99,100,
       "xuyehui", "biological", 90,90,90,70,100,
       "mengmeng", "Math", 100,100,100,100,90
   };
    int i;
    for(i=0; i<3; i++){
       printf("%s, %s, %ld, %.2f,%.2f,%.2f,%.2f\n", stu[i].name, stu[i].dep, stu[i].no,
               stu[i].score[0], stu[i].score[1], stu[i].score[2], stu[i].score[3]);
    }

stu_t * p = stu;
puts((*(p+1)).name); //(1) a pointer call style.
puts((p+1)->name); //(2) common pointer call style. (1) and (2) is the same.

printf("%s\n", (p+2)->name);
    printf("%s\n", (*(p+2)).name);
    printf("no = %ld\n", p->no);
    void modifyName(struct student * p){
           p->no = 123456;
    }

modifyName(p);
printf("%s\n", (p)->name);
printf("no = %ld\n", p->no);
}

2. UnionHandler.c

/*
* UnionHandler.c
*
* Created on: Jul 6, 2013
* Author: wangle
*/

#include <stdio.h>
int main(){
   union unidate{
       char c;
       int i;
       long l;
       float f
   };
   union unidate x;
   x.c=65;
   printf("c=%c\n", x.c);
   x.i = 10;
   printf("i=%d\n",x.i);
   x.l = 100;
   printf("l=%ld\n", x.l);
   x.f = 90.5;
   printf("f=%.1f\n", x.f);
   printf("c=%c\n", x.c);
}

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struct and union example

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