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1、1、用C语言编写程序，建立一个pipe,同时父进程生成一个子进程，子进程向pipe写入一 个字符串”Hello.”，父进程从pipe中读取该字符串。5#include #include #include #include #include #include int main()char buf20;int piledes2;pid_t pid;int ret;if(ret = pipe(piledes) = -1)perror(error on pipe:);exit(-1);elsepid = fork();if(pid 0)perror(error on fork:);exit(-1);e
2、lse if(pid = 0)close(piledes0);printf(to fu:);fgets(buf,sizeof(buf)-1,stdin);if(ret = write(piledes1,buf,strlen(buf) 0)perror(error on writing:);exit(-1);close(piledes1);else close(piledes1);if(ret = read(piledes0,buf,sizeof(buf)-1) 0)perror(error on reading:);exit(-1);bufret = 0;printf(from zi:%sn,
3、buf);close(piledes0);return 0;2、编写一个C语言程序lswc，使之功能能和ls | wc等价。(也就是利用，fork,exec,以及 ls,wc,以及重定向，或者是管道的系统调用)13#include #include #include #include #include #include #include #include #include #include #include #include #include #include int main(int argc,char *argv)int pildes2;int ret;char *argument3;pi
4、d_t pid;char buf1000;if(argc 2)printf(que shao can shun); exit(0);argument0 = ls;argument1 = /;argument2 = NULL;if(ret = pipe(pildes) 0)/ 、 perror(error on pipe:); exit(-1);pid = fork();if(pid 0)printf(fork errorn); exit(-1);if(pid = 0)close(pildes0);dup2(pildes1,1); execvp(ls,argument);close(pildes
5、1);elseclose(pildes1);/ dup2(fildes0,0); if(strcmp(argv1),wc) = 0) bzero(buf,sizeof(buf);if(ret = read(pildes0,buf,sizeof(buf) 0) printf(error on reading:); exit(-1); bufret = 0; printf(%s,buf); close(pildes0);return 0;3、实现一个具有头节点的链表。要求具有crea te, inser t, dele te, search功能，能对链 表。编写一个应用程序，使用上面的函数。 10
6、#include #include #include #include #define PASSWD 111111struct studentint num;char name20;float grade;struct student *next;typedef struct student stuNode;typedef struct student *stuPtr;int stuwrite(stuPtr head)FILE *fp;CC*/.、fp = fopen(stu,w); while(head-next != NULL)head = head-next; fwrite(head,s
7、izeof(stuNode),1,fp);close(fp);return 0;stuPtr sturead()FILE *fp;stuPtr head,p1,p2;int a;head = (stuPtr)malloc(sizeof(stuNode);head-next = NULL;p1 = head;CC*/.、fp = fopen(stu,r);dop2 = (stuPtr)malloc(sizeof(stuNode); p2-next = NULL;a = fread(head,sizeof(stuNode),1,fp); p1-next = p2;p1 = p2;while(a =
8、 1);fclose(fp);return head;void creat()stuPtr head,p;head = (stuPtr)malloc(sizeof(stuNode); p = (stuPtr)malloc(sizeof(stuNode); p-next = NULL;head-next = p;printf(学号：)；scanf(%d,&(p-num);getchar();printf(姓名：)；scanf(%s,p-name);getchar();printf(成绩：)； scanf(%f,&(p-grade); getchar();stuwrite(head);stuPtr
9、 insert(stuPtr head)stuPtr p,q;p = (stuPtr)malloc(sizeof(stuNode);printf(学号：)；scanf(%d,&(p-num); getchar();printf(姓名：)；scanf(%s,p-name);getchar();printf(成绩：)； scanf(%f,&(p-grade);getchar();q = head;while(q-next != NULL & p-num q-next-num) q = q-next;p-next = q-next;q-next = p;stuwrite(head);p = stur
10、ead();return p;stuPtr search(stuPtr head,int num)stuPtr p1,p2;int flag;p1 = (stuPtr)malloc(sizeof(stuNode);p2 = (stuPtr)malloc(sizeof(stuNode);p1 = head; while(p1-next != NULL) flag = 0;p2 = p1;p1 = p1-next;if(p1-num = num)flag = 1; break;if(flag = 1)p1 = p2;return p1;elseprin tf(没有此人n);return NULL;
11、stuPtr delete(stuPtr head, int num) stuPtr p1,p2;int flag;p1 = search(head,num);p2 = p1-next;p1-next = p2-next;free(p2);stuwrite(head);p1 = sturead();return p1;void print(stuPtr head)stuPtr p; int i;prin tf(学号t姓名t成绩n);p = head-next;while(p != NULL)if(p-num 0 & p-grade 0) printf(%dt%st%.1fn,p-num,p-n
12、ame,p-grade);p = p-next;void print1(stuPtr p)prin tf(学号t姓名t成绩n);while(p != NULL)if(p-num 0 & p-grade 0) printf(%dt%st%.1fn,p-num,p-name,p-grade);p = p-next;int main()int choose,num;stuPtr head,p;head = (stuPtr)malloc(sizeof(stuNode);p = (stuPtr)malloc(sizeof(stuNode);while(1)prin tf(l t创建链表n2 t添加节点n3t删除节点n4t查找学生n5t查看所有 学生信息nOt退出n);scanf(%d,&choose);switch(choose)case 1:creat();break;case 2: head = sturead(); insert(head);break;case 3:head = sturead();printf(删除学生的学号：); scanf(%d,&num);delete(head,num);break;case 4:head = sturead();printf(学生学号：
