C language student management system source sharing

This article example for you to share the C language student management system source code, for your reference, the specific content is as follows

#include<stdio.h> 
#include<stdlib.h> 
// The structure can store the maximum number of students information, immutable variables 
 int const MAX_LENGTH=100; 
 // An array of student information structures that can be stored at most 100 Individual student information  
 struct student{
 int id; // Student id  
 char *name; // The name  
 int age; // age 
 float c_score; //C Language performance  
 float english_score; // English  
 float database_score; // Database score 
 float total_score; // Total score  
 }student_array[MAX_LENGTH]; 
 
 // Amount of student information  
 int student_count=0; 

 // Function declaration  
 void print_all_students();
 void input_info(); 
 void query_info();
 void modify_info();
 void delete_info(); 
 void compute_total_score();
 void sort_info(); 
 int search_one_student(); 
 void print_one_student(struct student one);
 void delete_one_student(int student_index);
 char * get_item_name(int item_index);
 void modify_one_student(int student_index);
 void sort_by_id();
 void sort_by_c_score(); 
 void sort_by_english_score(); 
 void sort_by_database_score();

 // The main function  
 int main()
 {
 while(1)
 { 
 printf(" Please select the feature to use: \n");
 printf(" Input information, please enter 1 And hit enter! \n");
 printf(" For information, please enter 2 And hit enter! \n"); 
 printf(" To modify the information, please enter 3 And hit enter! \n"); 
 printf(" To delete information, please enter 4 And hit enter! \n"); 
 printf(" Calculate the total score, please enter 5 And hit enter! \n"); 
 printf(" Sort information, please enter 6 And hit enter! \n"); 
 printf(" Output all, please input 0 And hit enter! \n");
 printf(" To exit the program, please enter -1 And hit enter! \n"); 
 // Function selection variable  
 int function=0;
 // Enter the selected function number value  
 scanf("%d",&function); 
 // According to the input function number, perform the corresponding function 
 switch(function){
 case -1: 
  exit(1);
 case 0: 
  print_all_students(); 
  break;
 case 1: 
  input_info();
  break;
 case 2:
  query_info();
  break; 
 case 3: 
  modify_info();
  break; 
 case 4: 
  delete_info();
  break; 
 case 5: 
  compute_total_score(); 
  break; 
 case 6:
  sort_info(); 
  break; 
 default: 
  printf(" Please enter the correct function number!! \n\n");
  break;
 } 
 } 
 return 0; 
 } 
 
 // Input information function 
void input_info()
 {
 printf(" Current function -- input information! \n"); 
 // To see if there's room  
 if(student_count<MAX_LENGTH)
 {
 // The statement 1 Some temporary variables 
 int id=0; char *name=(char *)malloc(100);
 int age=0; float c_score=0; 
 float english_score=0;
 float database_score=0; 
 printf(" Please enter student information in the form of student number , The name , age ,C Language performance , English , Database score \n");
 scanf("%d %s %d %f %f %f",&id,name,&age,&c_score,&english_score,&database_score);
 printf(" Student information proofreading: student no. : %d, Name: %s, Age: %d,C Language performance :%f, English score: %f, Database achievements: %f\n",id,name,age,c_score,english_score,database_score); 
 // Student information is added to the array of structs  
 student_array[student_count].id=id;
 student_array[student_count].name=name;
 student_array[student_count].age=age;
 student_array[student_count].c_score=c_score; 
 student_array[student_count].english_score=english_score; 
 student_array[student_count].database_score=database_score; 
 student_count++; 
 // Whether to continue to input information 
 printf(" Do you want to continue to input information? To continue, please enter y, Return to main menu input n\n");
 char go_on; 
 scanf("%s",&go_on); 
 if(go_on=='y')
 { 
  input_info();
 } 
 }
 else
 { 
 printf(" The student struct data is full and can be deleted 1 Part of the student information! \n");
 }
 } 


 // Query information function  
void query_info()
 {
 printf(" Current function -- query information! \n");
 printf(" Please enter the student's student number \n"); 
 int id=0; 
 scanf("%d",&id);
 // Find the input id Student number 
 int student_index=search_one_student(id);
 if(student_index!=-1)
 {
 print_one_student(student_array[student_index]); 
 }
 else
 { 
 printf(" No student with that number! \n");
 } 
 // Whether to continue to query the information  
 printf(" Do you want to continue searching for information? To continue, please enter y, Return to main menu input n\n");
 char go_on; 
 scanf("%s",&go_on);
 if(go_on=='y') 
 query_info();
 } 
 
 
 // Modify information function 
void modify_info()
 { 
 printf(" Current function - - modify information! \n");
 printf(" Please enter the student's student number \n");
 int id=0; 
 scanf("%d",&id);
 // Find the input id Student number 
 int student_index=search_one_student(id);
 if(student_index!=-1)
 { 
 modify_one_student(student_index); 
 }
 else
 { 
 printf(" No student with that number! \n");
 } 
} 
 
 
 // Delete information function  
void delete_info()
 { 
 printf(" Current function -- -- delete information! \n");
 printf(" Please enter the student's student number \n"); 
 int id=0;
 scanf("%d",&id);
 // Find the input id Student number 
 int student_index=search_one_student(id);
 if(student_index!=-1)
 { 
 // To prevent student_index It's changed, it's passed in temp_index To calculate 
 int temp_index=student_index;
 print_one_student(student_array[temp_index]);
 // Confirm before deleting 
 printf(" Be sure to delete the student number  %d  Student information? To continue, please enter y\n",id);
 char be_true; 
 scanf("%s",&be_true);
 if(be_true=='y')
 { 
  printf("%d\n", student_index); 
  // Perform the delete action  
  delete_one_student(student_index); 
 } 
 }
 else
 { 
 printf(" No student with that number! \n"); 
 } 
 // Whether to continue to delete information 
 printf(" Do you want to continue deleting the information? To continue, please enter y, Return to main menu input n\n");
 char go_on; 
 scanf("%s",&go_on);
 if(go_on=='y') 
 delete_info();
 } 
 
 
 // Calculate the total score function  
void compute_total_score()
 { 
 printf(" Current function -- calculate total score! \n"); 
 for (int i = 0; i < student_count; ++i)
 { 
  student_array[i].total_score=student_array[i].c_score+student_array[i].english_score+student_array[i].database_score; 
  print_one_student(student_array[i]);
  printf(" Overall: %f\n", student_array[i].total_score);
 } 
 printf(" Total points calculated complete!! \n");
 } 
 
 
 // Ranking function 
void sort_info()
 {
 printf(" Current function - - grades sorting! \n"); 
 printf(" The information of all students before ranking is as follows: \n");
 print_all_students();
 int sort_type;
 while(1)
 { 
 printf(" Please enter the sorting field, student number: 1,C Language performance :2, English score: 3, Database achievements: 4\n");
 scanf("%d",&sort_type);
 if(sort_type>=1&&sort_type<=4)
 break; 
 }
 switch(sort_type)
 { 
 case 1: 
 sort_by_id(); 
 break; 
 case 2:
 sort_by_c_score();
 break;
 case 3: 
 sort_by_english_score(); 
 break; 
 case 4: 
 sort_by_database_score(); 
 break;
 } 
 printf(" The information of all students is as follows: \n");
 print_all_students(); 
 // Whether to continue to delete information  
 printf(" Do you want to continue sorting the information? To continue, please enter y, Return to main menu input n\n"); 
 char go_on;
 scanf("%s",&go_on);
 if(go_on=='y')
 sort_info();
 } 


// According to the student number entered, traverse the array of structs. If the student exists, return the subscript of the array -1
int search_one_student(int id)
 {
 for (int i = 0; i < student_count; ++i)
 { 
 if(student_array[i].id==id)
 { 
  return i;
 }
 } 
 return -1; 
 } 


// Output information about a student  
void print_one_student(struct student one)
{
 printf(" Student information: student no. : %d, Name: %s, Age: %d,C Language performance :%f, English score: %f, Database achievements: %f\n",one.id,one.name,one.age,one.c_score,one.english_score,one.database_score);
} 


// Output information for all students 
void print_all_students()
{ 
 if(student_count==0)
 {
 printf(" No student information available \n\n\n");
 }
 for (int i = 0; i < student_count; ++i)
 { 
 print_one_student(student_array[i]);
 } 
} 


void modify_one_student(int student_index)
{ 
 // Output student information before modification  
 print_one_student(student_array[student_index]); 
 // The initial value of the field number  
 int item_index=0; 
 // No modification of student number field is allowed  
 while(1)
 { 
 printf(" Please enter the number and name of the field to be modified: 1, Age: 2,C Language performance :3, English score: 4, Database achievements: 5\n"); 
 scanf("%d",&item_index); 
 if(item_index>=1&&item_index<=5)
 break; 
 } 
 switch(item_index)
 { 
 case 1: 
  printf(" Please enter the  %s  The new value of the field \n", get_item_name(item_index)); 
  char* item_value_1=(char *)malloc(100);
  ; 
  scanf("%s",item_value_1);
  student_array[student_index].name=item_value_1;
  break;
 case 2:
  printf(" Please enter the  %s  The new value of the field \n", get_item_name(item_index));
  int item_value_2; 
  scanf("%d",&item_value_2);
  student_array[student_index].age=item_value_2;
  break;
 case 3: 
  printf(" Please enter the  %s  The new value of the field \n", get_item_name(item_index));
  float item_value_3;
  scanf("%f",&item_value_3); 
  student_array[student_index].c_score=item_value_3;
  break; 
 case 4:
  printf(" Please enter the  %s  The new value of the field \n", get_item_name(item_index));
  float item_value_4;
  scanf("%f",&item_value_4); 
  student_array[student_index].english_score=item_value_4;
  break; 
 case 5:
  printf(" Please enter the  %s  The new value of the field \n", get_item_name(item_index)); 
  float item_value_5;
  scanf("%f",&item_value_5); 
  student_array[student_index].database_score=item_value_5;
  break; 
 }
 printf(" Modified successfully! The new student information is as follows: \n");
 // Output student information after modification  
 print_one_student(student_array[student_index]);
 // Whether to continue to delete information  
 printf(" Will you continue to modify the student's information? To continue, please enter y, Return to main menu input n\n");
 char go_on; 
 scanf("%s",&go_on);
 if(go_on=='y') 
 modify_one_student(student_index);
} 


// Delete the array corresponding to the sequence number of the student information, put i The data group element behind the position moves forward to overlay i . student_count counter 1 
void delete_one_student(int student_index)
{
 for (int i = student_index; i < student_count-1; ++i) 
 { 
 student_array[i]=student_array[i+1]; 
 } 
 student_count--;
 printf(" Deleting completed \n\n\n"); 
} 


// Returns the field name based on the field number entered 
char * get_item_name(int item_index)
{ 
 switch(item_index)
 { 
 case 0:
  return " Student id "; 
 case 1: 
  return " The name "; 
 case 2:
  return " age ";
 case 3:
  return "C Language performance "; 
 case 4:
  return " English ";
 case 5: 
  return " Database score ";
 default: 
  return "";
 } 
} 


// In accordance with the id Sort, using the simplest bubble sort 
void sort_by_id()
{ 
 for (int i = 0; i < student_count; ++i)
 {
 for (int j = i; j < student_count; ++j) 
 { 
  if(student_array[i].id>student_array[j].id)
  {   
  struct student temp=student_array[i]; 
  student_array[i]=student_array[j];
  student_array[j]=temp;
  } 
 } 
 } 
 printf(" In accordance with the   Student id   Order to complete \n");
} 


// In accordance with the C Language grade sorting, using the simplest bubble sorting method 
void sort_by_c_score()
{ 
 for (int i = 0; i < student_count; ++i)
 { 
 for (int j = i; j < student_count; ++j)
 {
  if(student_array[i].c_score>student_array[j].c_score)
  { 
  struct student temp=student_array[i];
  student_array[i]=student_array[j]; 
  student_array[j]=temp;
  } 
 } 
 }
 printf(" In accordance with the  C Language performance   Order to complete \n");
} 


// Sort by English score, using the simplest bubble sort  
void sort_by_english_score()
{ 
 for (int i = 0; i < student_count; ++i)
 { 
 for (int j = i; j < student_count; ++j)
 { 
  if(student_array[i].english_score>student_array[j].english_score)
  { 
  struct student temp=student_array[i]; 
  student_array[i]=student_array[j]; 
  student_array[j]=temp;
  }
 }
 }
 printf(" In accordance with the   English   Order to complete \n"); 
} 


// Sort by database score, using the simplest bubble sort  
void sort_by_database_score()
{ 
 for (int i = 0; i < student_count; ++i)
 { 
 for (int j = i; j < student_count; ++j)
 {
  if(student_array[i].database_score>student_array[j].database_score)
  { 
  struct student temp=student_array[i]; 
  student_array[i]=student_array[j]; 
  student_array[j]=temp;
  } 
 }
 } 
 printf(" In accordance with the   Database score   Order to complete \n");
}

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