Design of grade management system for C language students

  • 2020-06-01 10:39:02
  • OfStack

The example of this paper is to share the specific code of C language student performance management system for your reference. The specific content is as follows

Ps: I added a linked list to sort and wrote it in bubbles.


/* 
 Title : Student's score management system 
 Author: nyist_xiaod 
 Date : 2012.5.8 
*/ 
 
#include <stdio.h> 
#include <conio.h> 
#include <string.h> 
#include <stdlib.h> 
 
#define Print_Head_Num puts(" The class    The name     Chinese language and literature   mathematics   English   Total grade ") 
#define Print_Head_Cla puts(" Student id    The name     Chinese language and literature   mathematics   English   Total grade ") 
#define Print_Head_All puts(" The class    Student id    The name     Chinese language and literature   mathematics   English   Total grade ") 
 
typedef struct Node Node; 
 
struct Score 
{ 
 int chinese,math,english,sum; 
}; 
 
struct Node 
{ 
 char name[20],classs[20],number[20]; 
 struct Score score; 
 struct Node* next; 
}*head,*u,*p,*q; 
 
int n,C,M,E,Cj,Cy,Mj,My,Ej,Ey; 
char num[20]; 
 
void Welcome() 
{ 
 printf("\t\t  %c %c %c %c %c %c %c %c %c %c %c %c %c %c %c %c %c\n",4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4); 
 printf("\t\t  %c  Welcome to the student grade management system  %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   1. Read the file    %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   2. Save the file    %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   3. Add student grades   %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   4. Revise students' grades   %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   5. Delete student grades   %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   6. Enquiry of my grades   %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   7. Check the grades of the class   %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   8. Check school grades   %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c   9. Exit management system   %c\n",4,4); 
 printf("\t\t  %c        %c\n",4,4); 
 printf("\t\t  %c %c %c %c %c %c %c %c %c %c %c %c %c %c %c %c %c\n\n",4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4); 
 printf("\t\t   Please enter the instruction :(1-9) "); 
} 
Node* new_node(Node* uu) 
{ 
 uu = (Node*)malloc(sizeof(Node)); 
 uu->next = NULL; 
 return uu; 
} 
void Add() 
{ 
 u = new_node(u); 
 printf("\n Please enter the information of the student you want to join :\n"); 
 printf("\n The name : "); 
 scanf("%s",u->name); 
 printf("\n The class : "); 
 scanf("%s",u->classs); 
 printf("\n Student id : "); 
 scanf("%s",u->number); 
 printf("\n Chinese, math and English : "); 
 scanf("%d%d%d",&u->score.chinese,&u->score.math,&u->score.english); 
 u->score.sum = u->score.chinese + u->score.math + u->score.english; 
 u->next = head->next; 
 head->next = u; 
 printf("\n---> Add a success !\n"); 
} 
void Mod() 
{ 
 n = 0; 
 printf("\n Please enter the student number you want to modify : "); 
 scanf("%s",num); 
 for(u = head; u != NULL;u = u->next) 
 { 
  if(strcmp(u->number,num) == 0) 
  { 
   n = 1; 
   printf("\n Please enter your new Chinese, maths and English scores : "); 
   scanf("%d%d%d",&u->score.chinese,&u->score.math,&u->score.english); 
   u->score.sum = u->score.chinese + u->score.math + u->score.english; 
   printf("\n---> Modify the success !\n"); 
   break; 
  } 
 } 
 if(!n) 
  printf("\n---> There is no information about the student !\n"); 
} 
void Del() 
{ 
 n = 0; 
 printf("\n Please enter the student number you want to delete : "); 
 scanf("%s",num); 
 for(u = head; u != NULL;u = u->next) 
 { 
  if(strcmp(u->number,num) == 0) 
  { 
   n = 1; 
   p->next = u->next; 
   free(u); 
   printf("\n---> Delete the success !\n"); 
   break; 
  } 
  p = u; 
 } 
 if(!n) 
  printf("\n---> There is no information about the student !\n"); 
} 
void Sort() 
{ 
 int i,j; 
 n = 0; 
 for(u = head->next; u != NULL;u = u->next) 
  n++; 
 for(i=1;i<=n;i++) 
 { 
  u = head; 
  for(j=0;j<n-i;j++) 
  { 
   p = u->next; 
   q = p->next; 
   if(strcmp(p->classs,q->classs) > 0 || strcmp(p->classs,q->classs) == 0 && p->score.sum < q->score.sum) 
   { 
    u->next = q; 
    p->next = q->next; 
    q->next = p; 
   } 
   u = u->next; 
  } 
 } 
} 
void Que_One() 
{ 
 n = 0; 
 printf("\n Please enter the student number of the student you want to query : "); 
 scanf("%s",num); 
 for(u = head->next; u != NULL;u = u->next) 
 { 
  if(strcmp(u->number,num) == 0) 
  { 
   n = 1; 
   printf("\n"); 
   Print_Head_Num; 
   printf("%-11s%-15s",u->classs,u->name); 
   printf("%-6d%-6d%-6d%-6d\n",u->score.chinese,u->score.math,u->score.english,u->score.sum); 
   break; 
  } 
 } 
 if(!n) 
  printf("\n---> There is no information about the student !\n"); 
} 
void Analyze_Sco(Node *uu) 
{ 
 C += uu->score.chinese; 
 M += uu->score.math; 
 E += uu->score.english; 
 if(uu->score.chinese >= 60) 
  Cj++; 
 if(uu->score.chinese >= 90) 
  Cy++; 
 if(uu->score.math >= 60) 
  Mj++; 
 if(uu->score.math >= 90) 
  My++; 
 if(uu->score.english >= 60) 
  Ej++; 
 if(uu->score.english >= 90) 
  Ey++; 
} 
void Print_Sco() 
{ 
 printf(" Language average : %-6.2f,  pass : %%%-6.2f ,  proficiency : %%%-6.2f.\n\n",(float)C/n,(float)100*Cj/n,(float)100*Cy/n); 
 printf(" Math gpa : %-6.2f,  pass : %%%-6.2f ,  proficiency : %%%-6.2f.\n\n",(float)M/n,(float)100*Mj/n,(float)100*My/n); 
 printf(" Average score in English : %-6.2f,  pass : %%%-6.2f ,  proficiency : %%%-6.2f.\n\n",(float)E/n,(float)100*Ej/n,(float)100*Ey/n); 
} 
void Que_Cla() 
{ 
 Sort(); 
 n = C = M = E = Cj = Cy = Mj = My = Ej = Ey = 0; 
 printf("\n Please enter the class you want to query : "); 
 scanf("%s",num); 
 printf("\n"); 
 for(u = head->next; u != NULL;u = u->next) 
 { 
  if(strcmp(u->classs,num)) 
   continue; 
  if(!n) 
   Print_Head_Cla; 
  n++; 
  printf("%-11s%-15s",u->number,u->name); 
  printf("%-6d%-6d%-6d%-d\n",u->score.chinese,u->score.math,u->score.english,u->score.sum); 
  Analyze_Sco(u); 
 } 
 if(!n) 
 { 
  printf(" There is no student information for this class !\n"); 
  return ; 
 } 
 printf("\n There are altogether students in this class  %d  people .\n\n",n); 
 Print_Sco(); 
 
} 
void Que_All() 
{ 
 Sort(); 
 n = C = M = E = Cj = Cy = Mj = My = Ej = Ey = 0; 
 printf("\n"); 
 if(head->next == NULL) 
 { 
  printf("---> No student information !\n"); 
  return ; 
 } 
 Print_Head_All; 
 for(u = head->next; u != NULL;u = u->next) 
 { 
  n++; 
  printf("%-12s%-12s%-15s",u->classs,u->number,u->name); 
  printf("%-6d%-6d%-6d%-d\n",u->score.chinese,u->score.math,u->score.english,u->score.sum); 
  Analyze_Sco(u); 
 } 
 printf("\n All students in the school  %d  people .\n\n",n); 
 Print_Sco(); 
} 
void Save() 
{ 
 char c; 
 printf("\n Confirm save? (Y/N): "); 
 scanf("%*c%c",&c); 
 if(c == 'N') 
  return ; 
 FILE *fp; 
 if((fp=fopen("C:\\data.txt","w"))==NULL) 
 { 
  printf("\n---> Unable to open file \n"); 
  return ; 
 } 
 fputs(" The class    Student id    The name     Chinese language and literature   mathematics   English   Total grade ",fp); 
 if(head->next != NULL) 
  fputs("\n",fp); 
 for(u = head->next; u != NULL;u = u->next) 
 { 
  fprintf(fp,"%-11s%-11s%-15s",u->classs,u->number,u->name); 
  fprintf(fp,"%-6d%-6d%-6d%-d",u->score.chinese,u->score.math,u->score.english,u->score.sum); 
  if(u->next != NULL) 
   fprintf(fp,"\n"); 
 } 
 fclose(fp); 
 printf("\n---> Achievements deposited successfully C:\\\\data.txt In the \n"); 
} 
void Open() 
{ 
 printf("\n Please put the data in the directory C:\\\\data.txt In the , Press any key to confirm .\n"); 
 getch(); 
 FILE *fp; 
 if((fp=fopen("C:\\data.txt","r"))==NULL) 
 { 
  printf("\n---> No file found !\n"); 
  return ; 
 } 
 char tmp[100]; 
 fgets(tmp,66,fp); 
 while(!feof(fp)) 
 { 
  u = new_node(u); 
  fscanf(fp,"%s%s%s",u->classs,u->number,u->name); 
  fscanf(fp,"%d%d%d%d",&u->score.chinese,&u->score.math,&u->score.english,&u->score.sum); 
  u->next = head->next; 
  head->next = u; 
 } 
 printf("\n---> Grades read in successfully !\n"); 
 fclose(fp); 
} 
void Exi() 
{ 
 char c; 
 printf("\n Are you sure to quit? (Y/N): "); 
 scanf("%*c%c",&c); 
 if(c == 'N') 
  return ; 
 system("cls"); 
 printf("\n\n"); 
 printf("\t\t\t  %c %c %c %c %c %c %c %c %c\n",4,4,4,4,4,4,4,4,4); 
 printf("\t\t\t  %c Made by Xiaod %c\n",4,4); 
 printf("\t\t\t  %c %c %c %c %c %c %c %c %c\n",4,4,4,4,4,4,4,4,4); 
 printf("\t\t\t       Thank you!\n\n\n"); 
 exit(0); 
} 
int main() 
{ 
 int orz; 
 system("color 0B"); 
 head = new_node(head); 
 while(1) 
 { 
  Welcome(); 
  scanf("%d",&orz); 
  system("cls"); 
  switch(orz) 
  { 
   case 1:Open();break; 
   case 2:Save();break; 
   case 3:Add();break; 
   case 4:Mod();break; 
   case 5:Del();break; 
   case 6:Que_One();break; 
   case 7:Que_Cla();break; 
   case 8:Que_All();break; 
   case 9:Exi();break; 
   default :printf("\n---> Invalid instruction !\n"); 
  } 
  printf("\n"); 
  system("pause"); 
  system("cls"); 
 } 
 return 0; 
} 

For more information, please refer to the topic "management system development".


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