IOday5

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/wait.h>
int main(int argc, const char *argv[])
{
    pid_t pid;  
    char *res = "temp";  
	char *res1 ="temp1";
	char buf[64];
	char buff[32];
    if (mkfifo(res, 0666) ==-1 || mkfifo(res1,0664)==-1) {  
        perror("mkfifo");  
        exit(1);
	}
    pid = fork();  
    if (pid < 0) {  
        perror("fork");  
        exit(1);  
    }  
    if (pid > 0)
	{  
        /* 父进程 */  
        FILE *fp; 
		FILE *fp1;
        fp = fopen(res, "w"); 
		fp1 = fopen(res,"r");
        if (fp == NULL||fp1==NULL)
		{  
            perror("fopen");  
            return 1;  
        }  
        fputs("world\n",fp1);
		if(fp == NULL)
		{
			perror("error");
		}
		return 1;
		fgets(buff,32,fp);
		printf("父进程接受到：%s",buff);
		fclose(fp);
		fclose(fp1);
		wait(NULL);
		remove(res);
		remove(res1);
    }
	else
	{  
        /* 子进程 */  
        FILE *fp; 
		FILE *fp1; 
        fp = fopen(res, "r"); 
		fp1 = fopen(res1,"w");
        if (fp1 == NULL || fp==NULL)
		{  
            perror("fopen");  
            return 1;
        }  
        fgets(buf, 64, fp1);  
        printf("子进程接受到：%s", buf);  
		fputs("hello\n",fp1);
		if(fp==NULL)
		{
			perror("fopen");
		}
		return 1;
        pclose(fp1);
		pclose(fp);
    } 
	return 0;
}

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
typedef	struct student{
        char name[20];
		int age;
		double math_score;
		double chinese_score;
		double English_score;
		double physical_score;
		double chemical_score;
		double biological_score;
	}stu;
int main(int argc,const char*argv[])
{
	struct Student  stu[3];
    strcpy(stu[0].name,"张三");
    stu[0].age  = 13;
    stu[0].math_score = 68;
    stu[0].chinese_score = 78;
    stu[0].english_score = 87;
    stu[0].physical_score = 90;
    stu[0].chemical_score = 90;
    stu[0].biological_score = 87;

    strcpy(stu[1].name,"李四");
    stu[1]. age  = 20;
    stu[1]. math_score = 80;
    stu[1].chinese_score = 80;
    stu[1].english_score = 80;
    stu[1].physical_score = 80;
    stu[1].chemical_score = 80;
    stu[1].biological_score = 80;
	FILE*fp=fopen("./demo1.txt","w");
	if(fp==NULL)
	{
		printf("fopen");
		return 1;
	}  for(int i = 0;i < 2;i++)
    {
        
        int res = fprintf(fp,"%s %d %lf %lf %lf %lf %lf %lf\n",stu[i].name,stu[i].age,stu[i].math_score,stu[i].chinese_score,stu[i].english_score,stu[i].physical_score,stu[i].chemical_score,stu[i].biological_score);
        if(res < 0){
            perror("Error fprintf");
            return 1;
        }
    }
    fclose(fp);
    FILE * fp2 = fopen("./demo1.txt","r");
    if(fp2 == NULL){
        printf("Cannot open file");
        exit(1);
    }
    while(fscanf(fp,"%s %d %lf %lf %lf %lf %lf %lf",stu->name,&stu->age,&stu->math_score,&stu->chinese_score,&stu->english_score,&stu->physical_score,&stu->chemical_score,&stu->biological_score) != EOF){
        printf("%s %d %lf %lf %lf %lf %lf %lf\n",stu->name,stu->age,stu->math_score,stu->chinese_score,stu->english_score,stu->physical_score,stu->chemical_score,stu->biological_score);

    }
    fclose(fp2);
    return 0;	
}