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该作业是 作业 学生通讯录管理#xff1a;文本文件增删改查#xff08;C版本#xff09; 的C 语言版本。
具体的作业题目描述#xff0c;要求#xff0c;可以参考 学生通讯录管理#xff1a;文本文件增删改查#xff08;C版本#xff09;。…C自学精简教程 目录(必读)
该作业是 作业 学生通讯录管理文本文件增删改查C版本 的C 语言版本。
具体的作业题目描述要求可以参考 学生通讯录管理文本文件增删改查C版本。
为何要有这个作业
这个作业同时提供C和C两个版本是我精心设计的。
很多人不清楚到底C和C 有何区别。
这两个作业的输入一模一样输出也一模一样。
本文为了对比C和C两种语言特意使用C重新原样实现了一遍。
让学生对面向对象和面向过程的的不同有一个直观的认识。
启动代码
下面是C 语言版本的代码完整实现比C 版本多了10行代码
#include stdio.h
#include string.h
#include assert.h
#define bool int
#define true 1
#define false 0
#define NAME_LENGTH 30
#define TEL_LENGTH 15typedef struct _Person
{int m_id;char m_name[NAME_LENGTH];char m_tel[TEL_LENGTH];
} Person;
void print_person(Person* person)
{//-表示左对齐默认右对齐printf(%-5d%-15s%-20s\n, person-m_id, person-m_name, person-m_tel);
}
//返回 bool 表示读取到了文件的末尾
bool read_person(FILE* fp, Person* person)
{bool result false;if (fscanf(fp, %d %s %s, person-m_id, person-m_name, person-m_tel) 0){result true;}else{result false;}return result;
}
void write_person(FILE* fp, Person* person)
{// 就像read_person 是从文件里读取内容使用的是fscanf// 写入文件使用fprintf 语法类比printf//(1) your code}
typedef struct _PersonManager
{Person m_allPerson[100];int size;
} PersonManager;
void InitPersonMgr(PersonManager* personMgr)
{//(2) your code}
void push_back(PersonManager* personMgr, Person* person)
{personMgr-m_allPerson[personMgr-size] *person;
}
void erase_person(PersonManager* personMgr, int index)
{assert(index 0 index personMgr-size);for (int i index; i personMgr-size - 1; i){//(3) your code}personMgr-size - 1;
}
void InputOnePerson(PersonManager* personMgr);
bool DeletePerson(PersonManager* personMgr)
{printf(Please input person id for delete:);int id;scanf(%d, id);for (int i 0; i personMgr-size; i){if (personMgr-m_allPerson[i].m_id id){//(4) your codereturn true;}}return false;
}
bool QueryPersonByName(PersonManager* personMgr)
{printf(Please input name for query:);char name[NAME_LENGTH];scanf(%s, name);for (int i 0; i personMgr-size; i){if (strcmp( personMgr-m_allPerson[i].m_name, name) 0){printf(Find:\n);//(5) your code return true;}}printf(not found %s\n, name);return false;
}
bool QueryPersonByTel(PersonManager* personMgr)
{printf(Please input tel for query:);char tel[TEL_LENGTH];scanf(%s, tel);for (int i 0; i personMgr-size; i){if (strcmp(personMgr-m_allPerson[i].m_tel, tel) 0){printf(Find:\n);print_person(personMgr-m_allPerson[i]);return true;}}printf(not found %s\n, tel);return false;
}
void ShowAllPerson(PersonManager* personMgr)
{printf(All Person:\n);printf(id name tel\n);for (int i 0; i personMgr-size; i){print_person(personMgr-m_allPerson[i]);}
}
bool SaveAllPersonToFile(PersonManager* personMgr)
{FILE* fp fopen(data_saved.txt, w);//以写方式打开文件if (fp NULL){printf(can not open file data_saved.txt for write data.\n);return false;}for (int i 0; i personMgr-size; i){//(6) your code}fclose(fp);return true;
}
bool LoadAllPersonFromFile(PersonManager* personMgr, const char* fileName)
{FILE* fp fopen(fileName, r);//只读方式打开文本文件if (fp NULL){printf(load data failed . file %s not exits.\n, fileName);return false;}Person person;while (read_person(fp, person)){push_back(personMgr, person);}printf(load data from file success.\n);fclose(fp);return true;
}
void InputOnePerson(PersonManager* personMgr)
{printf(Please input one person\n);printf(Please input id);int id;scanf(%d, id);Person person;memset(person, 0, sizeof(Person));person.m_id id;for (int i 0; i personMgr-size; i){if (personMgr-m_allPerson[i].m_id id){printf(%d already existed! Save failed.\n, id);return;}}printf(Please input name);scanf(%s, person.m_name);printf(Please input tel);scanf(%s, person.m_tel);printf(Input finished, save successed.\n);//(7) your code}
int main(int argv, char* argc[])
{PersonManager personMgr;InitPersonMgr(personMgr);LoadAllPersonFromFile(personMgr, input_data.txt);ShowAllPerson(personMgr);while(true){printf(input a commond : \n);printf(1 [AddPerson]\n);printf(2 [ShowAllPerson]\n);printf(3 [QueryPerson by name]\n);printf(4 [QueryPerson by tel]\n);printf(5 [SaveAllPersonToFile]\n);printf(6 [DeletePerson]\n);printf(0 [ExitAndSaveChange]\n);int commond;scanf(%d, commond);switch(commond){case 1: { InputOnePerson(personMgr); break;}case 2: { ShowAllPerson(personMgr); break;}case 3: { QueryPersonByName(personMgr); break;}case 4: { QueryPersonByTel(personMgr); break;}case 5: { SaveAllPersonToFile(personMgr); break;}case 6: { DeletePerson(personMgr); break;}case 0: { SaveAllPersonToFile(personMgr); return 0;}default:{ printf(System Exit.\n); return 0;}}}return 0;
} 运行结果
和C 一模一样
load data from file success.
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
4 zhangsan4 13788889994
5 wanger 13333333333
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
2
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
4 zhangsan4 13788889994
5 wanger 13333333333
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
1
Please input one person
Please input id1
Please input namezhangsan
Please input tel13344445555
Input finished, save successed.
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
2
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
4 zhangsan4 13788889994
5 wanger 13333333333
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
3
Please input name for query:zhangsan
Find:
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
3
Please input name for query:zhang
not found zhang
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
4
Please input tel for query:13344445555
Find:
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
4
Please input tel for query:1334444
not found 1334444
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
6
Please input person id for delete:4
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
2
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
5 wanger 13333333333
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
5
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
0
最终保存数据到文件 data_saved.txt
文件 data_saved.txt 的内容为
2 zhangsan2 13788889992
3 zhangsan3 13788889993
5 wanger 13333333333
1 zhangsan 13344445555
你的结果也是这样吗
答案在此
C自学精简教程 全部答案 学生代码的运行结果
