# include & ltstdio.h & gt
# include & ltconio.h & gt
# include & ltstring.h & gt// contains header files that use strcmp.
void Menu()； //Main menu
void Infobase()； //Information maintenance
void Find()； //Information inquiry
void InfoStat()； //Performance statistics
void Comp()； //Result ranking
void Find _ ID()； //Search by Student ID
void Find _ name()； //Find by name
void Infobase _ add()； //Enter information
void Infobase _ amend()； //Modify the information
void Delete()； //Delete information
Typedef struct // Rename the student information structure.
{
Character name [10]; //Name
char sex[3]； //Gender
Int ID// student number
Int mathematics; //Math scores
Int English; //English scores
int computer _ C； //Computer C language scores
Int sum// total score
} students;
void main()
{
int chg= 1，n；
Printf ("\ t \ tWelcome to use this management system, please use it normally under Debug \ n");
White (chg)
{
menu()；
scanf("%d "，& ampn)；
Switch (n)
{
Case 1:
infobase()； //Information maintenance
Break;
Case 2:
find()； //Information inquiry
Break;
Case 3:
InfoStat()； //Performance statistics
Break;
Case 4:
comp()；
Break; //Result ranking
Case 0:
chg = 0； //Exit the menu
Printf ("(_)) Thanks for using! Goodbye \ n ");
Break;
Default value:
Printf("(~_~)) selection error (0~4)? Please re-enter \ n ");
}
}
getch()；
}
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Invalid menu ()
{
printf(" \ t \ t \ t * * * * * * * * * * * * * * * * * * \ n ")；
printf(" \ t \ t \ t * * * * \ n ")；
Printf ("\ t \ t * * main menu * * \ n ");
printf(" \ t \ t \ t * * * * \ n ")；
printf(" \ t \ t \ t * * * * * * * * * * * * * * * * * * \ n ")；
Printf ("\ t \ t1information maintenance \ n");
Printf ("\ t \ t 2 information query \ n ");
Printf("\t\t\t 3 score statistics \ n ");
Printf ("\ t \ t 4 rank sorting \ n");
Printf ("\ t \ t0Exit menu \ n");
}
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void Infobase()
{
int n，chg = 1；
White (chg)
{
Printf ("\ t \ t1enter student information \ n");
Printf("\t\t\t2 Modify student information \ n ");
Printf ("\ t \ t \ t3Delete student information \ n");
Printf ("\ t \ t \ tReturn to the main menu \ n");
scanf("%d "，& ampn)；
Switch (n)
{
Case 1:
infobase _ add()； //Enter information
Break;
Case 2:
infobase _ amend()； //Modify the information
Break;
Case 3:
delete()； //Delete information
Case 0:
chg = 0； //Return to the main menu
Break;
Default value:
Wrong selection of Printf("\t(~_~)), please re-enter \ n: ");
}
}
}
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void Infobase_add()
{
Student Stu [1]; //Defines an array variable of type Student.
FILE * fp = NULL// Declares a file pointer.
Fp=fopen ("special week. txt "，" a ")； //Open by appending
Printf ("\ tEnter name, gender and student number (foreign language C for mathematics) \ n");
Scanf("% s% s% d% d% d ",///receives input.
Stu [0]. Name,
Stu [0]. Sex,
& Stu [0]. ID，
& Stu [0]. Math,
& Stu [0]. English,
& Stu [0]. Computer _ c);
Stu [0]. sum=stu[0]。 English +stu[0]. computer_C+stu[0]。 Mathematics; //Calculate the total score
If (fprintf (fp, "%s% s% d% d% d \ n"),//Write to disk to prevent errors.
Stu [0]. Name,
Stu [0]. Sex,
Stu [0]. ID，
Stu [0]. Math,
Stu [0]. English,
Stu [0]. Computer _C,
Stu [0]. Sum) ==0)
{
Printf ("write failure");
}
fclose(FP)； //Close the file pointer
}
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void Infobase_amend()
{
int i，j；
char ch[ 10]； //Declare a character array to save the name to be modified.
Student Stu [50]; //Declare an array of students.
FILE * fp = NULL// Declares a file pointer.
Printf ("\ tEnter the name of the student to be modified"); //Prompt for input
scanf("%s "，ch)； //Receive the input name
Fp=fopen ("special week. txt”、“rt+”； //Open in read/write mode.
for(I = 0； ; i++)
{
Fscanf(fp, "%s% s% d% d% d% d", // d% d% d ",//Read memory from disk.
Stu [me]. Name,
Stu [me]. Sex,
& Stu [me]. ID，
& Stu [me]. Math,
& Stu [me]. English,
& Stu [me]. Computer _C,
& Stu [me]. sum)；
If (strcmp (stu [I].name, ch)= = 0)// Judge whether you find what you need.
{
Rewind (FP); //The pointer moves to the beginning of the file.
Printf(" \ ten Enter and modify the name, gender and student number (Math Foreign Language C language) \ n ");
Scanf("% s% s% d% d% d ",///receives input.
Stu [me]. Name,
Stu [me]. Sex,
& Stu [me]. ID，
& Stu [me]. Math,
& Stu [me]. English,
& Stu [me]. Computer _ c);
j = I；
Stu [me]. sum=stu[i]。 English +stu[i]. Computer _C+stu[i]. Mathematics;
for(I = 0； I & ltj；; i++)
{
Fprintf (fp, "%s% s% d% d% d \ n",//The original data was written to disk.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum)；
}
Fprintf(fp, "%s% s% d% d% d", // d% d% d ",//writes the modified data to disk.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum)；
fclose(FP)； //Close the file pointer
Break;
}
}
}
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Void delete ()
{
int i，j，k = 0；
char ch[ 10]； //Declare a character array to save the name to be deleted.
Student Stu [50]; //Declare an array of students.
FILE* fp=NULL，* FP 1 = NULL； //Declare file pointer
Printf ("\ tEnter the name of the student to be deleted"); //Prompt for input
scanf("%s "，ch)； //Receive the input name
Fp=fopen ("special week. txt”、“rt+”； //Open in read/write mode.
for(I = 0； ! feof(FP)； i++)
{
Fscanf(fp, "%s% s% d% d% d% d", // d% d% d ",//Read memory from disk.
Stu [me]. Name,
Stu [me]. Sex,
& Stu [me]. ID，
& Stu [me]. Math,
& Stu [me]. English,
& Stu [me]. Computer _C,
& Stu [me]. sum)；
If (strcmp (stu [I].name, ch)= = 0)// Judge whether you find what you need.
j = I；
}
Rewind (FP); //The pointer moves to the beginning
for(； j & ltI- 1； j++)
{
stu[j]= stu[j+ 1]； //Overwrite the items to be deleted, and then move forward in turn.
}
for(I = 0； I & ltj；; i++)
Fprintf (fp% s% s% d% d% d% d \ n ",///Write to disk.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum)；
}
fclose(FP)；
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void Find()
{
int n，chg = 1； //Declare the chg variable for the loop.
White (chg)
{
Printf ("\ t \ t1query by student number \ n");
Printf("\t\t\t2 Query by name \ n ");
Printf ("\ t \ t \ tReturn to the main menu \ n");
scanf("%d "，& ampn)；
Switch (n)
{
Case 1:
find _ ID()； //Call the function of student number search.
Break;
Case 2:
find _ name()； //Call the function to find by name.
Break;
Case 0:
chg = 0； //Return to the main menu
Break;
Default: printf("\n(~_~) is selected incorrectly, please re-enter \ n ");
}
}
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
void Find_ID()
{
int n，I；
Student Stu [50]; //Declare an array variable of type Student
FILE * fp = NULL// Declares a file pointer.
Printf ("Please enter your student number"); //Prompt for input
scanf("%d "，& ampn)； //Receive the input student number.
Fp=fopen ("special week. txt”、“rt”)； //Open as read-only
for(I = 0； ! feof(FP)； i++)
{
If (fscanf (fp, "%s% s% d% d% d \ n"),//Prevent reading into memory from failing.
Stu [me]. Name,
Stu [me]. Sex,
& Stu [me]. ID，
& Stu [me]. Math,
& Stu [me]. English,
& Stu [me]. Computer _C,
& Stu [me]. Sum) ==0)
Printf ("read failure");
If (Stu [I]. ID==n) // Judge whether to find a student.
{
Printf ("Found: %s Gender %s Student ID %d Math %d Foreign Language %d C Language %d Total Score %d\n",//Output the search target.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum)；
Break;
}
If(feof(fp)) // Handle the case that it is not found.
{
Printf ("No information about this student \ n");
}
} f close(FP)； //Close the file pointer
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
void Find_name()
{
int I；
char ch[ 10]； //Declare a character array to store the lookup name.
Student Stu [50]; //Declare an array variable of type Student
FILE * fp = NULL// Declares a file pointer.
Printf ("Please enter a name \ n"); //Prompt for input
scanf("%s "，ch)； //Receive the input name
Fp=fopen ("special week. txt”、“rt”)； //Open as read-only
for(I = 0； ! feof(FP)； I++) // loop, ending the loop with a file pointer pointing to the end.
{
Fscanf(fp, "%s% s% d% d% d% d", // d% d% d ",//Read memory from disk.
Stu [me]. Name,
Stu [me]. Sex,
& Stu [me]. ID，
& Stu [me]. Math,
& Stu [me]. English,
& Stu [me]. Computer _C,
& Stu [me]. sum)；
If (strcmp (stu [I].name, ch)= = 0)// Judge whether to find students.
{
Printf ("Found: %s Gender %s Student ID %d Math %d Foreign Language %d C Language %d Total Score %d\n",//Output the search target.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum)；
Break;
}
If(feof(fp)) // Handle the case that it is not found.
{
Printf ("No information about this student \ n");
}
} f close(FP)； //Close the file pointer
}
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void InfoStat()
{
int n，m，I，count = 0；
char ch[ 15]； //Declare that the character array holds the course name.
Student Stu [60]; //Declare an array variable of type Student
FILE * fp = NULL// Declares a file pointer.
Fp=fopen ("special week. txt”、“rt”)； //Open as read-only
Printf ("Enter the course name (foreign language of mathematics C) and fraction segment (format: mathematics x1-x2) \ n");
scanf("%s "，ch)； //Receive the entered course name.
scanf("%d-%d "，& ampn & amp； m)； //receive an input fraction segment
for(I = 0； ! feof(FP)； I++) // End the loop with a file pointer to the end of the file.
{
If (fscanf (fp, "%s% s% d% d% d \ n"),//Prevent reading into memory from failing.
Stu [me]. Name,
Stu [me]. Sex,
& Stu [me]. ID，
& Stu [me]. Math,
& Stu [me]. English,
& Stu [me]. Computer _C,
& Stu [me]. Sum) ==0)
Printf ("read failure");
count++；
}
fclose(FP)； //Close the file pointer
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Printf ("name and gender %s total score \n", ch);
for(I = 0； I < count; i++)
If(strcmp(ch, "mathematics") = = 0&; & Stu [me]. Math & gt= n & amp& amp stu [me]. Mathematics < = m)
{
printf("%s\t%s\t%d\t%d\n "，
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. Math,
Stu [me]. sum)；
}
for(I = 0； I < count; i++)
If(strcmp(ch, "foreign language") = = 0&; & Stu [me]. English & gt= n & amp& amp stu [me]. English < = m)
{
printf("%s\t%s\t%d\t%d\n "，
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. English,
Stu [me]. sum)；
}
for(I = 0； I < count; i++)
If (! strcmp(ch，" C ")& amp； & Stu [me]. Computer _ C>= n & amp& amp stu [me]. Computer _ c < = m)
{
printf("%s\t%s\t%d\t%d\n "，
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. English,
Stu [me]. sum)；
}
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Invalid compensation ()
{
int i，k，j，count = 0；
char ch[ 15]； //Declare that the character array holds the course name.
Student stu[50], a temporary worker; //Declare a student variable.
FILE * fp = NULL// Declares a file pointer.
Printf ("Please enter the course name to sort"); //Prompt for input
scanf("%s "，ch)； //Receive the entered course name.
Fp=fopen ("special week. txt”、“rt”)； //Open the file as read.
for(I = 0； ! feof(FP)； I++) // End the loop with a file pointer to the end.
{
If (fscanf (fp, "%s% s% d% d% d \ n"),//Prevent reading into memory from failing.
Stu [me]. Name,
Stu [me]. Sex,
& Stu [me]. ID，
& Stu [me]. Math,
& Stu [me]. English,
& Stu [me]. Computer _C,
& Stu [me]. Sum) ==0)
Printf ("read failure");
count++； //Record the number of students in the file.
}
fclose(FP)； //Close the file pointer
If(strcmp(ch，" mathematics") ==0)
{
for(I = 0； I< count-1; I++) // The following are sorted in descending order.
{
k = I；
for(j = I+ 1； J< counting; j++)
if(stu[k]。 Mathematics & lt Stu [j]. Mathematics)
k = j；
If (me! =k)
{
temp = stu[I]；
stu[I]= stu[k]；
stu[k]= temp；
}
}
Printf ("name, gender, student number, foreign language of mathematics, total score of C language, ranking of mathematics scores \ n");
for(I = 0； I < count; i++)
{
Printf ("%-6s% 4s% d% d% d% d \ n",//output information.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum，I+ 1)；
}
}
If(strcmp(ch, "foreign language") ==0)
{
for(I = 0； I< count-1; I++) // The following are sorted in descending order.
{
k = I；
for(j = I+ 1； J< counting; j++)
if(stu[k]。 English & lt Stu [j]. English)
k = j；
If (me! =k)
{
temp = stu[I]；
stu[I]= stu[k]；
stu[k]= temp；
}
}
Printf ("name, gender, student number, math, foreign language, C language, total score, foreign language score ranking \ n");
for(I = 0； I < count; i++)
{
Printf ("%-6s% 4s% d% d% d% d \ n",//output information.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum，I+ 1)；
}
}
if(strcmp(ch，" C")==0)
{
for(I = 0； I< count-1; I++) // The following are sorted in descending order.
{
k = I；
for(j = I+ 1； J< counting; j++)
if(stu[k]。 Computer _ C< stu [j]. Computer _C)
k = j；
If (me! =k)
{
temp = stu[I]；
stu[I]= stu[k]；
stu[k]= temp；
}
}
Printf ("name, gender, student number, math, foreign language, total score of C language, ranking of C language scores \ n");
for(I = 0； I < count; i++)
{
Printf ("%-6s% 4s% d% d% d% d \ n",//output information.
Stu [me]. Name,
Stu [me]. Sex,
Stu [me]. ID，
Stu [me]. Math,
Stu [me]. English,
Stu [me]. Computer _C,
Stu [me]. sum，I+ 1)；
}
}
}