标准IO学习

思维导图：

有如下结构体
struct Student{
char name[16];
int age; double math_score;
double chinese_score;
double english_score;
double physics_score;
double chemistry_score;
double bio_score; };
申请该结构体数组，容量为5，初始化5个学生的信息
使用fprintf将数组中的5个学生信息，保存到文件中去下一次程序运行的时候，使用fscanf，
将文件中的5个学生信息，写入(加载)到数组中去，并直接输出学生信息

代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <wait.h>
#include <signal.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <semaphore.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include <sys/un.h>
#define MAX 5
typedef struct Student{
	char name[16];
	int age;
	double math_score;
	double chinese_score;
	double english_score;
	double physics_score;
	double chemistry_score;
	double dio_score;
}std,*std_p;
int main(int argc, const char *argv[])
{
	std_p S=(std_p)malloc(sizeof(std)*MAX);
	if(S==NULL){
		printf("fail to apply!\n");
		return -1;
	}
	for(int i=0;i<MAX;i++){
		printf("please enter name:");
		gets((S+i)->name);
		printf("please enter age:");
		scanf("%d",&(S+i)->age);
		printf("please enter math_score:");
		scanf("%lf",&(S+i)->math_score);
		printf("please enter chinese_score:");
		scanf("%lf",&(S+i)->chinese_score);
		printf("please enter english_score:");
		scanf("%lf",&(S+i)->english_score);
		printf("please enter physics_score:");
		scanf("%lf",&(S+i)->physics_score);
		printf("please enter chemistry_score:");
		scanf("%lf",&(S+i)->chemistry_score);
		printf("please enter dio_score:");
		scanf("%lf",&(S+i)->dio_score);
		getchar();
		putchar(10);
	}
	FILE* fp=fopen("./text","a");
	if(fp==NULL){
		perror("fppen");
		return 1;
	}
	for(int i=0;i<MAX;i++){
		fprintf(fp,"%s\n",(S+i)->name);
		fprintf(fp,"%d\n",(S+i)->age);
		fprintf(fp,"%lf\n",(S+i)->math_score);
		fprintf(fp,"%lf\n",(S+i)->chinese_score);
		fprintf(fp,"%lf\n",(S+i)->english_score);
		fprintf(fp,"%lf\n",(S+i)->physics_score);
		fprintf(fp,"%lf\n",(S+i)->chemistry_score);
		fprintf(fp,"%lf\n",(S+i)->dio_score);
	}
	fclose(fp);
	FILE* fp1=fopen("./text","a+");
	if(fp==NULL){
		perror("fopen");
		return 1;
	}
	for(int i=0;i<MAX;i++){
		fscanf(fp1,"%s\n",(S+i)->name);
		fscanf(fp1,"%d\n",&(S+i)->age);
		fscanf(fp1,"%lf\n",&(S+i)->math_score);
		fscanf(fp1,"%lf\n",&(S+i)->chinese_score);
		fscanf(fp1,"%lf\n",&(S+i)->english_score);
		fscanf(fp1,"%lf\n",&(S+i)->physics_score);
		fscanf(fp1,"%lf\n",&(S+i)->chemistry_score);
		fscanf(fp1,"%lf\n",&(S+i)->dio_score);
	}
	fclose(fp1);
	for(int i=0;i<MAX;i++){
		printf("name:%s\n",(S+i)->name);
		printf("age:%d\n",(S+i)->age);
		printf("math_score:%lf\n",(S+i)->math_score);
		printf("chinese_score:%lf\n",(S+i)->chinese_score);
		printf("english_score:%lf\n",(S+i)->english_score);
		printf("physics_score:%lf\n",(S+i)->physics_score);
		printf("chemistry_score:%lf\n",(S+i)->chemistry_score);
		printf("dio_score:%lf\n",(S+i)->dio_score);
	}
	return 0;
}

终端运行结果：