smsystem.c

Linux环境下用C语言实现的学生管理系统

			if(record_pos>0){
				pos=record_pos-cur_pos;
				cur_pos--;
				record_pos--;
				setGUI(str,pos);
			}
			else if(record_pos==0){
				record_pos=record_sum-1;
				cur_pos=scr_sum-1;
				setGUI(str,record_sum-scr_sum);
			}
								
		}
	}	
}

void down(char * str){ //reaction to the down key
	int i,pos;
	//the sum of record less than the num of one screen can show
	if(record_sum==0){
		mvprintw(20,25,"Have no record!");
	}
	//when the sum of the record less than the sum of one screen can show			
	else if(record_sum<=scr_sum){
		record_pos=(record_pos+1)%record_sum;
		cur_pos=record_pos;
		setGUI(str,0);
	}
	//when the sum of the record more than the sum of one screen can show			
	else{
				
		if(cur_pos==scr_sum-1){//cursor is on the bottom
			if(record_pos<record_sum-1){
				record_pos++;
				setGUI(str,record_pos-cur_pos);
			}
			else if(record_pos==record_sum-1){//point to the end of the record
				record_pos=0;
				cur_pos=0;
				setGUI(str,record_pos);
			}						
		}
		else{//cursor is not on the bottom
			if(record_pos<record_sum-1){
				pos=record_pos-cur_pos;
				record_pos++;
				cur_pos++;
				setGUI(str,pos);
			}
			//when the record pointer point to the last record
			else if(record_pos==record_sum-1){
				record_pos=0;
				cur_pos=0;
				setGUI(str,0);
			}
		}
	}
}

void searchStudentInfo(){  //query student information
	int pos;
	readStudentRecord();
	record_pos=0;
	cur_pos=0;
	//create framework
	setGUI("Search Student Infomation",0);
	char ch;
	//reaction to the keyboard 
	if(record_sum>0){
	do{
		ch=getch(); //read from keyboard
		switch(ch){
		case 'u':  //upper key
			up("Search Student Infomation");
			break;
		case 'd': //down key
			down("Search Student Infomation");
			break;
		}
	}while(ch!=27);//press esc key to exit
	}
	else{
		attrset(COLOR_PAIR(6));
		mvprintw(22,30,"Have no record!");
		getch();
		refresh();
	}
}

void delStudentInfo(){//delete the select student record
	
	readStudentRecord();//read all the student record from the stored file
	record_pos=0;
	cur_pos=0;
	int pos,i;
	FILE *fp;
	//create framework
	setGUI("Delete Student Infomation",0);
	char ch,sure;
	//reaction to the keyboard 
	do{
	ch=getch(); //read from keyboard
	if(record_sum>0){
		switch(ch){
		case 'u':  //upper key
			up("Delete Student Infomation");
			break;
		case 'd': //down key
			down("Delete Student Infomation");
			break;
		case '\r':  //press enter key,show the student information 
			attrset(COLOR_PAIR(6));
			mvprintw(22,23,"Are you sure to delete student %ld(y/n):",student[record_pos].sno);
			echo();
			scanw("%c",&sure);
			noecho();
			if(sure=='y'||sure=='Y') //delete one record
			{		
				if(record_sum==1){// if the sum of the record is one
					record_sum=0;
					record_pos=0;
					cur_pos=0;
					setGUI("Have none student info!",0);
				}
				//if the sum of the record less than amount that one screen can show
				else if(record_sum<7){ 
					record_sum--;
					//when the current position is on the end of the record
					if(record_pos==record_sum){
						record_pos--;
						cur_pos--;
					}
					else{
						//move record
						for(i=record_pos;i<record_sum;i++)
							student[i]=student[i+1];
					}
					setGUI("Del Student Info!",0);
				}
			//when the sum of the record more than the amount that on screen can show
				else{
					record_sum--;
					//when the current position is at the head of the record
					if(record_pos==0){
						for(i=record_pos;i<record_sum;i++)
							student[i]=student[i+1];
						setGUI("Del Student Info",0);
					}
					else if(record_pos>0&&record_pos<record_sum){
						for(i=record_pos;i<record_sum;i++)
							student[i]=student[i+1];
				//when the last record is showing on the bottom of the screen
						if(record_pos-cur_pos+scr_sum-1==record_sum){
							cur_pos++;
							setGUI("Del Student Info",record_sum-scr_sum);
						}
						else
							setGUI("Del Student Info",record_pos-cur_pos);
					}
					else{
						record_pos--;
						cur_pos=scr_sum-1;
						setGUI("Del Student Info",record_sum-scr_sum);
					}
				}
				//write to the file
				fp=fopen("student.dat","w");
				fwrite(student,sizeof(STUDENT),record_sum,fp);
				fclose(fp);
			}
			break;
		default: 
			break;
		}
	}
	else{
		attrset(COLOR_PAIR(6));
		mvprintw(22,30,"Have no record!");
		refresh();
	}
	}while(ch!=27);//press esc key ,quit
}

void modifyStudentInfo(){  //amend the student info
	readStudentRecord();
	int pos,i;
	STUDENT ptr;
	FILE *fp;
	char ch;
	record_pos=0;
	cur_pos=0;
	//create framework
	setGUI("Modify Student Infomation",0);
	//reaction to the keyboard 
	if(record_sum>0){ //when the sum of record more than 0
	do{
		int flag=0;	
		
		ch=getch(); //read from keyboard
		ptr=student[record_pos];
		switch(ch){
		case 'u':  //upper key
			up("Modify Student Infomation");
			break;
		case 'd': //down key
			down("Modify Student Infomation");
			break;
		case '\r'://press enter key to ensure
			do{
				echo();
				attrset(COLOR_PAIR(4));
				move(22,22);
				clrtoeol();
				mvaddch(22,79,'*');
				// give a tip to show how to operate
				mvprintw(22,23,"Press z,n,a,s,c,e or m (esc to quit):");
				refresh();
			
				char change;
				change=getch();
				if(change==27)//press the key esc to exit
					break;
				else{
				move(22,22);
				clrtoeol();
				mvaddch(22,79,'*');
			
				switch(change){
				case 'z': //amend the student's NO.
					//attrset(COLOR_PAIR(6));
					mvprintw(22,30,"Modify sno");
					move(9,34+3);
					refresh();
					while(!scanw("%ld",&ptr.sno)){
						move(22,20);
						clrtoeol();
						mvaddch(22,79,'*');
						mvprintw(22,28,"Input data format error!");
						move(9,34+3);
						refresh();
					}
					flag=1;
					break;
				case 'n': //amend the student's name
					mvprintw(22,30,"Modify name");
					move(11,37+strlen(student[record_pos].name));
					refresh();
					scanw("%s",ptr.name);	
					flag=1;
					break;
				case 'a': //amend the age of the student
					mvprintw(22,30,"Modify age");
					move(13,37);
					refresh();
					while(!scanw("%d",&ptr.age)){
						move(22,20);
						clrtoeol();
						mvaddch(22,79,'*');
						mvprintw(22,28,"Input data format error!");
						move(13,37);
						refresh();
					}
					flag=1;
					break;
				case 's': //amend the sex of the student
					mvprintw(22,30,"Modify sex");
					move(15,42);
					refresh();
					scanw("%c",&ptr.sex);
					while(ptr.sex!='f'&&ptr.sex!='m'){
						move(22,20);
						clrtoeol();
						mvaddch(22,79,'*');
						mvprintw(22,28,"Input data format error!");
						move(15,42);
						refresh();
						scanw("%c",&ptr.sex);
					}
					flag=1;
					break;
				case 'c': //amend the chinese score
					mvprintw(22,30,"Modify chinese score");
					move(17,48);
					refresh();
					while(!scanw("%d",&ptr.lesson.chinese_score)){
						move(22,20);
						clrtoeol();
						mvaddch(22,79,'*');
						mvprintw(22,28,"Input data format error!");
						move(17,48);
						refresh();
					}
					flag=1;
					break;
				case 'e': //amend the english score
					mvprintw(22,30,"Modify english score");
					move(18,48);
					refresh();
					while(!scanw("%d",&ptr.lesson.english_score)){
						move(22,20);
						clrtoeol();
						mvaddch(22,79,'*');
						mvprintw(22,28,"Input data format error!");
						move(18,48);
						refresh();
					}
					flag=1;
					break;
				case 'm': //amend the math score
					mvprintw(22,30,"Modify math score");
					move(19,46);
					refresh();
					while(!scanw("%d",&ptr.lesson.math_score)){
						move(22,20);
						clrtoeol();
						mvaddch(22,79,'*');
						mvprintw(22,28,"Input data format error!");
						move(19,46);
						refresh();
					}
					flag=1; //if somethig changed ,set the flag
					break;
				defaule:
					break;

				}
				}
				noecho();
			}while(1);
			char sure;
			if(flag){//have something changed
				move(22,22);
				clrtoeol();
				mvaddch(22,79,'*');
				// make a sure
				mvprintw(22,25,"Are you sure to change?(y/n)");
				echo();
				scanw("%c",&sure);
				noecho();
				if(sure=='y'||sure=='Y'){
					student[record_pos]=ptr;
					//store the change record to the file
					fp=fopen("student.dat","w");
					fwrite(student,sizeof(STUDENT),record_sum,fp);
					fclose(fp);
					move(22,22);
					clrtoeol();
					mvaddch(22,79,'*');
					mvprintw(22,25,"Modify Successful!");
				}
			}
			break;
		default:
			break;
		}
		setGUI("Modify Student Info",record_pos-cur_pos);
	}while(ch!=27);//press esc key ,quit
	}
	else{//the sum of record is 0
		attrset(COLOR_PAIR(6));
		mvprintw(22,30,"Have no record!");
		getch();
		refresh();
	}
}

int main(){
	int choice;
	student=(STUDENT *)malloc(20*sizeof(STUDENT));
	while(1)
	{
		choice=mainGUI();
		switch(choice){
		case 0: //add a new student information
			createStudentInfo();
			break;
		case 1: //delete the selected student information
			delStudentInfo();			
			break;
		case 2: //amend the selected student information
			modifyStudentInfo();
			break;
		case 3: //see about the selected student information
			searchStudentInfo();
			break;
		case 4: // exit the system
			touchwin(stdscr);
			endwin();
			exit(0);
		}
	}
	printf("Done!\n");	
}