"C-Language student performance management system"

/* (staring at the first draw)
* Copyright Notice and version number of the program
* Copyright (c) 2011, Yantai University Students ' School of computer Science
* All rights reserved.
* File name: Student Performance Management System
* Author: Liujiangpo
* Completed Date: June 23, 2012
* Version number: v.623

* Descriptive narrative of tasks and solutions
* The gaze end of the program head
*/

#include "stdio.h" #include "string"/* Define student structure */struct student{Char id[20];     Char name[20];     float Mark1;     float MARK2;     float Mark3; Float average;};/ * Declare the student array and the number of students */struct Student Students[1000];int num=0; /* Averages */float AVG (struct Student stu) {return (Stu. Mark1+stu. Mark2+stu. MARK3)/3;}     /* Return array subscript */int Student_searchbyindex (char id[]) {int i by learning number;         for (i=0;i<num;i++) {if (strcmp (students[i].id,id) ==0) {return i; }} return-1;}     /* Returns array subscript */int Student_searchbyname (char name[]) by name {int i; for (i=0;i<num;i++) {if (strcmp (Students[i]).         Name,name) ==0) {return i; }} return-1;} /* Display a single student record */void student_displaysingle (int index) {printf ("%10s%10s%8s%8s%8s%10s\n", "Student Number", "name", "Score", "score", "Score", "     Average score ");     printf ("-------------------------------------------------------------\ n"); printf ("%10s%10s%8.2f%8.2f%8.2f%10.2f\n", Students[index].id,students[index]. Name, Students[index]. Mark1,students[index]. Mark2,students[index]. Mark3,students[index]. Average);}         /* Insert Student Information */void Student_insert () {while (1) {printf ("Please enter study number:");         scanf ("%s", &students[num].id);          GetChar ();         printf ("Please enter Name:"); scanf ("%s", &students[num].         Name);          GetChar ();         printf ("Please enter your score:"); scanf ("%f", &students[num].         MARK1);          GetChar ();         printf ("Please enter your score:"); scanf ("%f", &students[num].         MARK2);          GetChar ();         printf ("Please enter your score:"); scanf ("%f", &students[num].         MARK3);          GetChar (); Students[num].         Average=avg (Students[num]);          num++; printf ("Do you want to continue?"
 
 
(y/n) ");         if (getchar () = = ' n ') {break;     }}}/* Change student Information */void student_modify () {//float mark1,mark2,mark3;         while (1) {char id[20];         int index;         printf ("Please enter the student number for the change:");         scanf ("%s", &id);         GetChar ();         Index=student_searchbyindex (ID);         if (index==-1) {printf ("Student does not exist!\n");              } else {printf ("The Student information you want to change is: \ n");              Student_displaysingle (index);              printf ("--Please enter new value--\n");              printf ("Please enter the study number:");              scanf ("%s", &students[index].id);              GetChar ();              printf ("Please enter Name:"); scanf ("%s", &students[index].              Name);              GetChar ();              printf ("Please enter your score:"); scanf ("%f", &students[index].              MARK1);              GetChar ();              printf ("Please enter your score:"); scanf ("%f", &students[index].              MARK2);              GetChar (); printf ("Please enter intoPerformance: "); scanf ("%f", &students[index].              MARK3);              GetChar (); Students[index].         Average=avg (Students[index]); } printf ("Do you want to continue?" (         y/n) ");         if (getchar () = = ' n ') {break;     }}}/* Delete student information */void student_delete () {int i;         while (1) {char id[20];         int index;         printf ("Please enter the student number for deletion:");         scanf ("%s", &id);         GetChar ();         Index=student_searchbyindex (ID);         if (index==-1) {printf ("Student does not exist!\n");              } else {printf ("The Student information you want to delete is: \ n");              Student_displaysingle (index); printf ("Are you sure you want to delete it?"
 (y/n) ");                       if (getchar () = = ' Y ') {for (i=index;i<num-1;i++) {              students[i]=students[i+1];//the back of the object to move forward} num--;         } getchar (); } printf ("Do you want to continue? 
(y/n) ");         if (getchar () = = ' n ') {break;         }}}/* Query by name */void Student_select () {while (1) {char name[20];         int index;         printf ("Please enter the name of the student to be queried:");         scanf ("%s", &name);         GetChar ();         Index=student_searchbyname (name);         if (index==-1) {printf ("Student does not exist!\n");              } else {printf ("The Student information you are inquiring about is: \ n");         Student_displaysingle (index); } printf ("Do you want to continue?" (         y/n) ");         if (getchar () = = ' n ') {break;     }}}/* Sorted by average */void student_sortbyaverage () {int i,j;     struct Student tmp; for (i=0;i<num;i++) {for (j=1;j<num-i;j++) {if (students[j-1]. AVERAGE&LT;STUDENTS[J].                   Average) {tmp=students[j-1];                   STUDENTS[J-1]=STUDENTS[J];              students[j]=tmp; }}}}/* Display student information */void Student_Display () {int i;     printf ("%10s%10s%8s%8s%8s%10s\n", "Learning number", "name", "Score", "Score", "achievement", "average score");     printf ("-------------------------------------------------------------\ n"); for (i=0;i<num;i++) {printf ("%10s%10s%8.2f%8.2f%8.2f%10.2f\n", Students[i].id,students[i]. Name, Students[i]. Mark1,students[i]. Mark2,students[i]. Mark3,students[i].     Average);     }}/* Read the student information from the file */void io_readinfo () {file *fp;     int i;         if ((Fp=fopen ("Database.txt", "RB") ==null) {printf ("Cannot open file!\n");     Return     } if (Fread (&num,sizeof (int), 1,FP)!=1) {num=-1;          } else {for (i=0;i<num;i++) {fread (&students[i],sizeof (struct Student), 1,FP); }} fclose (FP);}     /* Write student information to file */void Io_writeinfo () {file *fp;     int i;         if ((Fp=fopen ("Database.txt", "WB") ==null) {printf ("Cannot open file!\n");     Return } if (Fwrite (&num,sizeof (int), 1,FP)!=1) {PrinTF ("Write File Error!\n");              } for (i=0;i<num;i++) {if (fwrite (&students[i],sizeof (struct Student), 1,FP)!=1) {         printf ("Write file Error!\n");  }} fclose (FP);}     /* Main program */void main () {int choice;     Io_readinfo ();         while (1) {/* Main Menu */printf ("\ n------Student performance Management system------\ n"); printf ("1.         Add student record \ n "); printf ("2.         Change student record \ n "); printf ("3.         Delete the student record \ n "); printf ("4.         Check student records by name \ n "); printf ("5.         Sort by average score \ n "); printf ("6.         Exit \ n ");         printf ("Please select (1-6):");         scanf ("%d", &choice);         GetChar ();              Switch (choice) {case 1:student_insert ();         Break              Case 2:student_modify ();         Break              Case 3:student_delete ();         Break              Case 4:student_select ();         Break              Case 5:student_sortbyaverage ();     Student_display ();         Break              Case 6:exit (0);         Break     } io_writeinfo (); }}

"C-Language student performance management system"