结构体实例

示例1：

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

int main(int argc,char * argv[]){
        
    struct student{
            
        int no; 
        //char name[20];
        char *name;
        char sex;
    }s={1001,"lilei",'M'};
                                                                                                                                                                                 
    struct student s2;
    struct student *s3;
    s2.no = 1002;
    s2.name = "hanmeimei";
    //strcpy(s2.name,"hanmeimei");
    s2.sex = 'F';
    s3 = &s2;
    printf("The student info is :\nNO:%d\nName:%s\nSex:%c\n",s.no,s.name,s.sex);
    printf("The student info is :\nNO:%d\nName:%s\nSex:%c\n",s2.no,s2.name,s2.sex);
    printf("The student info is :\nNO:%d\nName:%s\nSex:%c\n",s3->no,s3->name,s3->sex);

}

示例2:

/**
  *读写文件示例，使用结构体保存数据
  */
#include <stdio.h>
#include <stdlib.h>

struct VideoData{
	int exposure;
	int color;
	int gray;
};

int writeToFile(struct VideoData *dataSet,char *filepath);
int readFromFile(struct VideoData *dataSet,char *filepath);

/**
  *将结构体以键值对的形式写入文件filepath中
  */
int writeToFile(struct VideoData *dataSet,char *filepath){
	
	FILE *fp;
	if((fp = fopen(filepath,"w+")) == NULL){
		
		printf("open %s error!\n",filepath);
		return -1;
	}
	if(fwrite(dataSet,sizeof(struct VideoData),1,fp) != 1){
		printf("write error!\n");
		return -1;
	}
	fclose(fp);
	return 0;
}
/**
  *从filepath中读取内容
  */
int readFromFile(struct VideoData *dataSave,char *filepath){
	
	FILE *fp;
	if((fp = fopen(filepath,"r")) == NULL){
		
		printf("open %s error!\n",filepath);
		return -1;
	}
	if(fread(dataSave,sizeof(struct VideoData),1,fp) != 1){
		printf("read error!\n");
		return -1;
	}
	fclose(fp);
	return 0;
}

int main(int argc,char argv[]){

	struct VideoData dataSet;
	struct VideoData *datap;
	datap = &dataSet;
	printf("请输入3个整数，以空格隔开：\n");
	scanf("%d %d %d",&dataSet.exposure,&dataSet.color,&dataSet.gray);
	printf("请输入写入文件的绝对路径：\n");
	char *filepath = malloc(128);
	scanf("%s",filepath);
	//写入数据
	writeToFile(datap,filepath);
	//读出来
	struct VideoData readData;
	struct VideoData *readp;
	readp = &readData;
	readFromFile(readp,filepath);
	printf("exposure=%d\ncolor=%d\ngray=%d\n",(*readp).exposure,(*readp).color,(*readp).gray);
	exit(0);
}