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1.目标要求：

1.学生成绩管理系统
2.可增、删、改、查、浏览
2.数据保存在文件中

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2.C语言代码：

文件1：源文件

#include"mylist.h"//菜单设计 
void menu(){//所有文件都同步到文件 printf("-------------【学生管理信息】-------------------\n");printf("\t\t0.退出系统\n");printf("\t\t1.录入信息\n");printf("\t\t2.浏览信息\n");printf("\t\t3.修改信息\n");printf("\t\t4.删除信息\n");printf("\t\t5.查找信息\n");printf("------------------------------------------------\n");}
struct Node* list;
//用户的交互
//根据所选的菜单项，作相应的事情 
void keyDown(){int choice = 0;struct student data;struct Node* pMove = NULL;scanf("%d",&choice);switch(choice){case 0:printf("正常退出！\n");system("pause");exit(0);break;case 1:printf("-------------录入信息-------------------\n");//插入链表 fflush(stdin);	//清空缓冲区！！！！！！！！！ printf("请输入学生的\n姓名、年龄、性别、电话：\n");scanf("%s%d%s%s",data.name,&data.age,data.sex,data.tel);insertNodeByHead(list,data); break;case 2:printf("-------------浏览信息-------------------\n");printList(list);	//打印链表break;case 3:printf("-------------修改信息-------------------\n");printf("请输入要修改信息的学生姓名：");scanf("%s",data.name);reviseInfoByData(list,data.name); break;case 4:printf("-------------删除信息-------------------\n");printf("请输入删除学生的姓名：");scanf("%s",data.name);deleteNode(list,data.name);break;case 5:printf("-------------查找信息-------------------\n");printf("请输入要查找学生的姓名：");scanf("%s",data.name);if( pMove = searchInfoByData(list,data.name)){printf("姓名\t年龄\t性别\t电话\n"); printf("%s\t%d\t%s\t%s\n",pMove->data.name,pMove->data.age,pMove->data.sex,pMove->data.tel);}break;default:printf("选择错误，重新输入\n");system("pause");break; }writeInfoToFile(list,"1.txt");
} 
int main(){list = createList();readInfoFromFile(list,"1.txt");while(1){menu();keyDown();system("pause");system("cls");} system("pause");return 0;
}

文件2：mylist.h

#include<stdio.h>
#include<stdlib.h> 
#include<string.h> //数据的设计-----》学生信息抽象出
struct student{char name[20];int age;char sex[5];char tel[20];//	int math;
//	int english;
};//结构
//测试的结构 
struct Node{struct student data;struct Node* next;
}; 
//创建表头 
struct Node* createList(){struct Node* headNode = (struct Node*)malloc(sizeof(struct Node));headNode->next = NULL;return headNode;
}
//创建节点 
struct Node* createNode(struct student data){struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));newNode->data = data;newNode->next = NULL;return newNode;
} 
//插入结点(表头法)
void insertNodeByHead(struct Node* headNode, struct student data){struct Node* newNode = createNode(data);newNode->next = headNode->next; headNode->next = newNode;
}
//指定位置删除
void deleteNode(struct Node* headNode,char* name){struct Node* posFrontNode;struct Node* posNode;if(headNode->next == NULL){printf("链表为空！\n");return; }posFrontNode = headNode;posNode = headNode->next;while(posNode && strcmp(posNode->data.name,name)){posFrontNode = posNode;posNode = posFrontNode->next;}if(!posNode){printf("您要删除的数据不存在！\n"); return;}if(!strcmp(posNode->data.name,name)){posFrontNode->next = posNode->next;free(posNode);}
} 
//查找功能
struct Node* searchInfoByData(struct Node* headNode,char* name) {struct Node* posNode;if(headNode->next == NULL){printf("链表为空！\n");return NULL; }posNode = headNode->next;while(posNode && strcmp(posNode->data.name,name)){;posNode = posNode->next;}if(!posNode){printf("您要查找的数据不存在！\n"); return NULL;}return posNode; 
}
//修改功能
void reviseInfoByData(struct Node* headNode,char* name) {struct Node* posNode;if(headNode->next == NULL){printf("链表为空！\n");return; }posNode = headNode->next;while(posNode && strcmp(posNode->data.name,name)){;posNode = posNode->next;}if(!posNode){printf("您要修改的数据不存在！\n"); return;}printf("请输入学生[%s]的年龄、性别、电话：\n",posNode->data.name);scanf("%d%s%s",&posNode->data.age,posNode->data.sex,posNode->data.tel);
}
//文件读操作
void readInfoFromFile(struct Node* headNode,char* fileName){//1.打开文件FILE *fp;struct student data;fp = fopen(fileName,"r");if(fp == NULL){fopen(fileName,"w+");//打开文件具有创建功能 }//2.读文件 while(fscanf(fp,"%s\t%d\t%s\t%s\n",data.name,&data.age,data.sex,data.tel)!=EOF){insertNodeByHead(headNode,data); }//3.关闭文件fclose(fp);
}
//文件写操作
void writeInfoToFile(struct Node* headNode,char* fileName){//1.打开文件FILE *fp;fp = fopen(fileName,"w");struct Node* pMove = headNode->next;//2.写文件 while(pMove){fprintf(fp,"%s\t%d\t%s\t%s\n",pMove->data.name,pMove->data.age,pMove->data.sex,pMove->data.tel);pMove = pMove->next;}//3.关闭文件fclose(fp);
}//打印链表
void printList(struct Node* headNode){struct Node* pMove = headNode->next;//设计列数据的处理printf("姓名\t年龄\t性别\t电话\n"); while(pMove){printf("%s\t%d\t%s\t%s\n",pMove->data.name,pMove->data.age,pMove->data.sex,pMove->data.tel);pMove = pMove->next;}printf("\n");
}

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3.运行结果：