struct Teacher{
char id[11];
char name[31];
int collegeid;
int jobid;
}ter[NTer],tmpt; // use tmp to change
int tercnt=0; // count the number of all teacher
char col_sec[Ncol+1][31]={ "","Information","Engineer","Theory","Arts","Biology"}; // college nubmer to name
char job_sec[Njob+1][31]={ "","Professor","Ass-Professor","Teacher","Tutor"}; // job nubmer to name

该段特殊采用数字映射字符串的方法，将学院职称皆量化为int，方便后续的操作。

3.0.2 薪资信息结构体

struct Salary{
char id[11];
char name[31];
int collegeid;
int jobid;
int month;
double basicsal, addsal, subsal, theosal, truesal;
}sal[Nsal],tmps;
int salcnt=0; // count the number of all records

basicsal—基本工资，addsal—业绩津贴，subsal—扣除费用，theosal—应发工资，truesal—实发工资。

3.0.3 学院平均值统计结构体与职称平均值统计结构体

struct College
{
int collegeid;
double thavg,travg;
}col[6],tmpc;
struct Job
{
int jobid;
double thavg,travg;
}job[6],tmpj;

进行统计分析时使用。

3.1 Operation Functions 概述

该部分代码实现了程序与外接交互的全部功能。负责读取用户的操作输入，并与用户进行交互。该部分具体内容将在【四】中进行演示并介绍。

3.2 Check Functions 概述

该部分代码对实现程序鲁棒性检测及排除起到了重要作用，下面将依次介绍其实现方案。

3.2.1 checkten()--对输入的数字范围进行检测

（应用于用户菜单选择等）

int checkten(int L,int R)
{
char opeinp[20];
scanf("%s",opeinp);
while ((atoi(opeinp)) == 0 or (atoi(opeinp)) > R or (atoi(opeinp)) < L )
{
printf("your input is invalid,please input again(just number from %d to %d):____\b\b\b",L,R);
scanf("%s",opeinp);
}
return atoi(opeinp);
}

通过atoi函数实现输入字符串向int类型的转换工作，并判断其大小范围是否在给定的[L,R]区间内，如果非数字，或非所需区间，则给出提示并反复要求用户输入，直至用户输入合法，返回该数值。

3.2.2 checkdb()--检测用户输入是否为实数

（用于工资输入的鲁棒性检查）

double checkdb()
{
char opeinp[20];
scanf("%s",opeinp);
while ((atof(opeinp)) == 0)
{
printf("your input is invalid,please input again(just a real number):________\b\b\b\b\b\b\b\b");
scanf("%s",opeinp);
}
return atof(opeinp);
}

通过atof函数，将输入字符串转换为double类型，如若转换失败（atof返回值为0），则给出提示并反复要求用户输入，直至用户输入合法，返回该数值。

3.2.3 checkid()--检测用户输入id是否合法且合规

（用于id输入的鲁棒性检查）

void checkid(char * inpid, int judgeexist)
{ // if judgeexist == 1 , until input exist then return;
// if judgeexist == 2 , until input not exist return;
while(scanf("%s",inpid))
{
if(inpid[10] != '\0')
{ // check 10 digit to stop
printf("your ID format is invalid,please make sure it is consist of 10 nubmers,ID:__________\b\b\b\b\b\b\b\b\b\b");
continue;
}
int i;
for(i = 0; i < 10; i++)
{
if(inpid[i] > '9' or inpid[0] < '0')
{
printf("your ID format is invalid,please make sure it is consist of 10 nubmers,ID:__________\b\b\b\b\b\b\b\b\b\b");
break;
}
}
if(i==10)
{ // format valid
// to check existence
int f=0; // 0 not exist; 1 exist
for(i = 0;i < tercnt; i++)
{
if(strcmp(ter[i].id, inpid) == 0)
{
f=1;
//printf("your ID input is existed, please make sure it's new one's id,ID:__________\b\b\b\b\b\b\b\b\b\b");
break;
}
}
if(judgeexist==1)
{
if(f==0)
{
printf("your ID input is not existed, please make sure it's above one's id,ID:__________\b\b\b\b\b\b\b\b\b\b");
continue;
}
if(f==1)
{
return ;
}
}
if(judgeexist==2)
{
if(f==1)
{
printf("your ID input is existed, please make sure it's new one's id,ID:__________\b\b\b\b\b\b\b\b\b\b");
continue;
}
if(f==0)
{
return ;
}
}
}
}
return ; // no use,just done for warning
}

该函数6-10行判断输入是否为10位，10位判断合法后，进入每位是否为数字的判断，再次合法后，才将进入可选mode的判断。

该函数我设置为可选mode，如果judgeexist == 1 ,则直到所输入id存在于系统中才会返回，如果judgeexist == 1 ,则直到所输入id是不事先存在的才会返回。该实现有利于后续的实际操作

3.2.4 checkname()--检测用户名字是否存在

（用于检索名字时的鲁棒性检测）

int checkname(char * inpname)
{
int t=0;
rewind(stdin);
while(1)
{
gets(inpname);
rewind(stdin);
int i;
for(i=0;i<tercnt;i++)
{
if(strcmp(ter[i].name,inpname) == 0)
{
return 1;
}
}
printf("your name input is not existed, please make sure it's above one's name,NAME:__________\b\b\b\b\b\b\b\b\b\b");
t++;
if(t==5) break;
}
return 0;
}

该函数将遍历整个ter结构体内的所有name,直至有匹配才返回，如若一直未匹配，则证明不存在该名字，故提示用户重新输入。

3.2.5 checkmon()--用以检测所要查询的月份是否存在salary信息中

int checkmon(int * mon,char * id)
{
int t=1; // tried too many times
while(1)
{
t++;
if(searchsalid(id,*mon)!=-1) return 1;
printf("%d month do not have salary information\n",*mon);
printf("please resure and then INPUT:_____\b\b\b");
*mon=checkten(1,12);
if(t==5) break;
}
return 0;
}

通过调用searchsalid 并进行匹配实现（后续将介绍该函数）

3.3 Storage Functions 概述

这些函数实现了数据的录入，修改，删除，以及本地化SQL存储等功能。

接下来将一一介绍。

3.3.1 inpter() inpsal()--ter输入函数与 sal输入函数

void inpter(int tid,int notfirst)
{
printf("Input the Teacher's NAME:______________\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
rewind(stdin);
gets(ter[tid].name); // to ignored the sperate by space
printf("Input the college index of the teacher:\n1.Information,2.Engineer,3.Theory,4.Art,5.Biology. INPUT:___\b\b");
ter[tid].collegeid=checkten(1,5);
printf("Input the job index of the teacher:\n1.Professor,2.Ass-Professor,3.Teacher,4.Tutor. INPUT:___\b\b");
ter[tid].jobid=checkten(1,4);
struct Salary * sa;
for(sa=sal;sa<sal+salcnt;sa++)
{
if(strcmp(sa->id,ter[tid].id)==0)
{
strcpy(sa->name,ter[tid].name);
sa->jobid = ter[tid].jobid;
sa->collegeid = ter[tid].collegeid;
}
}
if(notfirst == 0) tercnt++;
showter(3,ter[tid].id);
if(notfirst == 0) tercnt--;
printf("BELOW INFORMATION SAVED SUCCESSFULly \n");
printf("PRESS ENTER TO CONTINUE.\n");getchar();getchar();
}
void inpsal(int sid,int notfirst)
{
printf("please input the month(nubmer from 1 to 12):______\b\b\b");
sal[sid].month=checkten(1,12);
printf("please input the basic salary:________\b\b\b\b\b\b\b\b");
sal[sid].basicsal=checkdb();
printf("please input the additional salary:________\b\b\b\b\b\b\b\b");
sal[sid].addsal=checkdb();
printf("please input the subtract salary:________\b\b\b\b\b\b\b\b");
sal[sid].subsal=checkdb();
sal[sid].theosal=sal[sid].basicsal+sal[sid].addsal;
sal[sid].truesal=sal[sid].theosal-sal[sid].subsal;
FreshSalName(sid);
if(notfirst == 0) salcnt++;
showsal(3,sal[sid].id,sal[sid].month);
if(notfirst == 0) salcnt--;
printf("BELOW INFORMATION SAVED SUCCESSFULlY \n");
printf("PRESS ENTER TO CONTINUE.\n");getchar();getchar();
}

该段代码实现了排除鲁棒性的输入功能，并将教师信息中的姓名,学院，职称等，（如果工资信息存在）更新给工资信息，且在输入完成后，显示最新信息，以便查验。

3.3.2 delter() delsal()--删除教师信息及薪资信息

void deleteter(char * id)
{
// through swap and cnt-- to complete the delete operation
swapter(&ter[tercnt-1],&ter[searchterid(id)]);
tercnt--;
}
void deletesal(char * id)
{
int i;
for(i=0;i<salcnt;i++)
{
if(strcmp(sal[i].id,id) == 0)
{
swapsal(&sal[i],&sal[salcnt-1]);
salcnt--;
}
FreshSalName(i); // to check bug
}
}

该删除方法为：交换当前元素和最后一位元素的全部信息（通过自定swap实现，后续将进行介绍），并将总元素个数的统计变量减一，以此实现该删除操作。

3.3.3 自定义简便SQL操作

已在3.0.0中介绍完毕，此处不再赘述。

3.4 Algorithm Functions 概述

该部分实现该程序的主要算法功能，接下来将一一介绍各函数的实现方法。

3.4.1 showter()--可选mode的教师信息列表打印函数

int showter(int mode,char * cc)
{ // mode == 1: show all information
// mode == 2: show NAME(tc)'s infromation
// mode == 3: show ID(tc)'s information
int re=-1;
struct Teacher * tc;
printf("\n---------------------------Basic Information---------------------\n");
printf("|ID\t\t|NAME\t\t|COLLEGE\t|JOB\t\t|\n");
printf("-----------------------------------------------------------------\n");
for(tc=ter;tc<ter+tercnt;tc++)
{
if(mode == 1) printf("|%s\t|%-15s|%-15s|%-15s|\n",tc->id,tc->name,col_sec[tc->collegeid],job_sec[tc->jobid]);
if(mode == 2 && (strcmp(tc->name,cc) == 0) ) printf("|%s\t|%-15s|%-15s|%-15s|\n",tc->id,tc->name,col_sec[tc->collegeid],job_sec[tc->jobid]);
if(mode == 3 && (strcmp(tc->id,cc) == 0) )
{
re=tc-ter; // return his cntid
printf("|%s\t|%-15s|%-15s|%-15s|\n",tc->id,tc->name,col_sec[tc->collegeid],job_sec[tc->jobid]);
}
}
printf("-----------------------------------------------------------------\n\n");
return re;
}
void showsal(int mode,char * cc,int mon)
{ // mode == 1: show all information
// mode == 2: show NAME(tc)'s infromation
// mode == 3: show ID(tc)'s information
// if mon == 0 then cout every information
// if mon == 1~12 then just cout the month's information
struct Salary * sa;
printf("\n-------------------------------------------------Salary Information------------------------------------------------------\n");
printf("|Month\t|ID\t\t|NAME\t\t|Basic($)\t|Allowance($)\t|Subtract($)\t|Theory($)\t|True($)\t|\n");
printf("-------------------------------------------------------------------------------------------------------------------------\n");
for(sa=sal;sa<sal+salcnt;sa++)
{
if(mode == 1 && (mon==0?1:sa->month==mon)) printf("|%d\t|%-15s|%-15s|%-15.2f|%-15.2f|%-15.2f|%-15.2f|%-15.2f|\n",sa->month,sa->id,
sa->name,sa->basicsal,sa->addsal,sa->subsal,sa->theosal,sa->truesal);
if(mode == 2 && (strcmp(sa->name,cc) == 0) && (mon==0?1:(sa->month==mon))) printf("|%d\t|%-15s|%-15s|%-15.2f|%-15.2f|%-15.2f|%-15.2f|%-15.2f|\n",sa->month,sa->id,
sa->name,sa->basicsal,sa->addsal,sa->subsal,sa->theosal,sa->truesal);
if(mode == 3 && (strcmp(sa->id,cc) == 0) && (mon==0?1:(sa->month==mon))) printf("|%d\t|%-15s|%-15s|%-15.2f|%-15.2f|%-15.2f|%-15.2f|%-15.2f|\n",sa->month,sa->id,
sa->name,sa->basicsal,sa->addsal,sa->subsal,sa->theosal,sa->truesal);
}
printf("-------------------------------------------------------------------------------------------------------------------------\n\n");
}