構造体の例

#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 :
NO:%d
Name:%s
Sex:%c
",s.no,s.name,s.sex);
    printf("The student info is :
NO:%d
Name:%s
Sex:%c
",s2.no,s2.name,s2.sex);
    printf("The student info is :
NO:%d
Name:%s
Sex:%c
",s3->no,s3->name,s3->sex);

}

/**
  *      ，         
  */
#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);

/**
  *               filepath 
  */
int writeToFile(struct VideoData *dataSet,char *filepath){
	
	FILE *fp;
	if((fp = fopen(filepath,"w+")) == NULL){
		
		printf("open %s error!
",filepath);
		return -1;
	}
	if(fwrite(dataSet,sizeof(struct VideoData),1,fp) != 1){
		printf("write error!
");
		return -1;
	}
	fclose(fp);
	return 0;
}
/**
  * filepath     
  */
int readFromFile(struct VideoData *dataSave,char *filepath){
	
	FILE *fp;
	if((fp = fopen(filepath,"r")) == NULL){
		
		printf("open %s error!
",filepath);
		return -1;
	}
	if(fread(dataSave,sizeof(struct VideoData),1,fp) != 1){
		printf("read error!
");
		return -1;
	}
	fclose(fp);
	return 0;
}

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

	struct VideoData dataSet;
	struct VideoData *datap;
	datap = &dataSet;
	printf("   3   ，     ：
");
	scanf("%d %d %d",&dataSet.exposure,&dataSet.color,&dataSet.gray);
	printf("            ：
");
	char *filepath = malloc(128);
	scanf("%s",filepath);
	//    
	writeToFile(datap,filepath);
	//   
	struct VideoData readData;
	struct VideoData *readp;
	readp = &readData;
	readFromFile(readp,filepath);
	printf("exposure=%d
color=%d
gray=%d
",(*readp).exposure,(*readp).color,(*readp).gray);
	exit(0);
}