The method of implementing simple student achievement management system with C language

C The method of realizing simple student achievement management system with language

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System interface and related requirements

1） System operation , Open the following interface . List the system help menu （ Command menu ）, Prompt for commands .

2） You haven't entered your grades at the beginning , So enter the command L And I can't list my grades . Should prompt “ The grade sheet is empty ！ Please use the command first T Enter student scores .”

Empathy , When inputting other grade processing commands, it will also be processed accordingly .

3） Enter the command T, call Type Sub function entry score .

The interface prompts you to enter the number of students

Input 3 prompt 3 Students 3 Course results , List the header of the transcript “ Student number Chinese language and literature mathematics English ”, Prompt student number ：1

Input 1 Student No 3 Course results , Use space between , End of carriage return . Prompt student number ：2

Input 2 Student No 3 Course results , Use space between , End of carriage return . Prompt student number ：3

Input 3 Student No 3 Course results , Use space between , End of carriage return .Type End of subfunction call , return . Prompt for commands .

4） Enter the command L , call List Sub function output score table .List End of subfunction call , return . Prompt for commands .

5） Enter the command A , call Average The subfunction calculates the average score , Tips “ The average score has been calculated . Please use the command L see .” Average End of subfunction call , return . Prompt for commands .
Enter the command L , call List Sub function output score table .List End of subfunction call , return . Prompt for commands .

6） Enter the command P , call Sort The sub function sorts the student records from high to low according to the average score , Tips “ To complete the order . Please use the command L see .” Sort End of subfunction call , return . Prompt for commands .

Enter the command L , call List Sub function output score table .List End of subfunction call , return . Prompt for commands .

7） Enter the command S , call Search Sub function queries student grades , Tips “ Enter the student number to query ”.

Input 2 find 2 Student No. and output .Search End of subfunction call , return . Prompt for commands .

8） Enter the command C Execute the clear screen function statement system(“clear”);

Clear everything on the screen . Prompt for commands .

9） Enter the command H call Help The sub function displays the help menu .Help End of subfunction call , return . Prompt for commands .

10） Enter the command Q , Exit the system .

Be careful ：

1） When outputting array elements , The student number should be handled separately , The output is an integer （ Namely reservation 0 Decimal place ）. Empathy , When calculating grades, you should also put the number 1 Put aside the student number in the column , Only the second 2 After column . Achievement retention 1 Decimal place .
2） Number of students n Throughout , adopt n The value of determines whether the sub function of the current command can be called and executed . for example ： When n=0 when , Note that the score has not been entered . And once you enter a command T, That is to call Type The sub function has entered the score , be n The value of is no longer 0. When n！=0 when , You can perform other performance operations , But you can no longer perform the operation of employment results . So when the command entered by the user cannot be executed , Prompt should be given .

Code

#include <stdio.h>#include <stdlib.h>//#include "hs.h"struct student{    int id;    float yw;    float sx;    float wy;    float pj;};void help(void);int type(struct student *p);void list(struct student *p,int n);void average(struct student *p,int n);void search (struct student *p);void sort(struct student *p,int n);int main(int argc, const char *argv[]){    char ch;    struct student stu[32];    int n=0;    while(1)    {        printf(" Please enter a command  = ");        //getchar();        scanf("%c",&ch);        putchar(10);        if(ch=='T')        {            n=type(stu);        }        else if(ch=='L')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else                list(stu,n);        }        else if(ch=='A')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else            {                average(stu,n);                printf(" The average score has been calculated , Please use the command L see ！\n");                putchar(10);            }        }        else if(ch=='H')            help();        else if(ch=='C')            system("clear");        else if(ch=='S')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else            {                search(stu);                putchar(10);            }        }        else if(ch=='P')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else            {                sort(stu,n);                putchar(10);            }        }        else if(ch=='Q')        {            printf("Press any key to continue!\n");            return -1;        }        getchar();    }    return 0;}int type(struct student *p){    int n=0;    printf(" Please input the number of students ：");    scanf("%d",&n);    printf(" Please enter the student's grades in three courses ：\n");    printf(" Student number   Chinese language and literature   mathematics   Foreign Languages \n");    for(int i=0;i<n;i++)    {        printf("%d    ",i+1);        struct student stu[i];        scanf("%f %f %f",&(p+i)->yw,&(p+i)->sx,&(p+i)->wy);    }    return n;}void list(struct student *p,int n){    printf(" The students' grades are as follows ：\n");    printf(" Student number   Chinese language and literature   mathematics   Foreign Languages   average \n");    for(int i=0;i<n;i++)    {        printf("%d    ",i+1);        printf("%.1f %.1f %.1f %.1f",p->yw,p->sx,p->wy,p->pj);        p++;        putchar(10);    }}void average(struct student *p,int n){    for(int i=0;i<n;i++)    {        (p->pj)=((p->yw)+(p->sx)+(p->wy))/3;        p++;    }}void help(void){    printf("**********************************\n");    printf(" *   Student achievement management system —— In the help menu   * \n");    printf("**********************************\n");    printf(" *   H =  Show help menu            * \n");    printf(" *   T =  Score entry                * \n");    printf(" *   A =  Calculate the student average          * \n");    printf(" *   L =  List the transcript              * \n");    printf(" *   P =  Sort by GPA from high to low  * \n");    printf(" *   S =  Inquire the student's grade by student number      * \n");    printf(" *   C =  Clear the screen                    * \n");    printf(" *   Q = Exit the system                 * \n");    printf("**********************************\n");    printf(" *Copyright(c) 2022.3.15 By liq* \n");    printf("**********************************\n");}void search(struct student *p){    int s=0;    printf(" Please enter the student number to be queried ：");    scanf("%d",&s);    printf(" Student number   Chinese language and literature   mathematics   Foreign Languages   average \n");    printf("%d   %.1f  %.1f  %.1f  %.1f",s,(p+s-1)->yw,(p+s-1)->sx,(p+s-1)->wy,(p+s-1)->pj);    putchar(10);}void sort(struct student *p,int n){    struct student temp;    int i,j;    for(i=0;i<n;i++)    {        for(j=0;j<n-i-1;j++)        {            if(p[j].pj<p[j+1].pj)            {                temp=p[j];                p[j]=p[j+1];                p[j+1]=temp;            }        }    }    printf(" Sort complete , Please use the command L see ！\n");}

Be careful

If it needs to be written in separate documents .
Just take out the function part of the above code , Create two new files ：fun.c、fun.h. among fun.c File is used to store the structure declaration and function part of the above code （ Add the corresponding header file ）.fun.h Used to store structure declaration and function declaration （ Add the corresponding header file ）.
Add the corresponding header file to the main function ：#include “fun.h”（ Double quotes , No <>).
When compiling, the main function and the newly created fun.c Compile files together , The operation is the same as before , use ./a.out Can run .

The details are shown in the following figure ：

1. Create two new files （ The same name , Different suffixes ）, Compile and run （ You need to compile multiple files at the same time ）.

2.hs.c Store the structure declaration and the corresponding function （ The functions in this can also be split into other files , I won't split it here ）.

#include <stdio.h>#include <stdlib.h>struct student{    int id;    float yw;    float sx;    float wy;    float pj;};int type(struct student *p){    int n=0;    printf(" Please input the number of students ：");    scanf("%d",&n);    putchar(10);    printf(" Please enter the student's grades in three courses ：\n");    putchar(10);    printf(" Student number   Chinese language and literature   mathematics   Foreign Languages \n");    for(int i=0;i<n;i++)    {        printf("%d    ",i+1);        struct student stu[i];        scanf("%f %f %f",&(p+i)->yw,&(p+i)->sx,&(p+i)->wy);    }    putchar(10);    return n;}void list(struct student *p,int n){    printf(" The students' grades are as follows ：\n");    printf(" Student number   Chinese language and literature   mathematics   Foreign Languages   average \n");    for(int i=0;i<n;i++)    {        printf("%d    ",i+1);        printf("%.1f %.1f %.1f %.1f",p->yw,p->sx,p->wy,p->pj);        p++;        putchar(10);    }    putchar(10);}void average(struct student *p,int n){    for(int i=0;i<n;i++)    {        (p->pj)=((p->yw)+(p->sx)+(p->wy))/3;        p++;    }}void help(void){    printf("**********************************\n");    printf(" *   Student achievement management system —— In the help menu   * \n");    printf("**********************************\n");    printf(" *   H =  Show help menu            * \n");    printf(" *   T =  Score entry                * \n");    printf(" *   A =  Calculate the student average          * \n");    printf(" *   L =  List the transcript              * \n");    printf(" *   P =  Sort by GPA from high to low  * \n");    printf(" *   S =  Inquire the student's grade by student number      * \n");    printf(" *   C =  Clear the screen                    * \n");    printf(" *   Q = Exit the system                 * \n");    printf("**********************************\n");    printf(" *Copyright(c) 2022.3.15 By liq* \n");    printf("**********************************\n");}void search(struct student *p){    int s=0;    printf(" Please enter the student number to be queried ：");    scanf("%d",&s);    putchar(10);    printf(" Student number   Chinese language and literature   mathematics   Foreign Languages   average \n");    printf("%d   %.1f  %.1f  %.1f  %.1f",s,(p+s-1)->yw,(p+s-1)->sx,(p+s-1)->wy,(p+s-1)->pj);    putchar(10);}void sort(struct student *p,int n){    struct student temp;    int i,j;    for(i=0;i<n;i++)    {        for(j=0;j<n-i-1;j++)        {            if(p[j].pj<p[j+1].pj)            {                temp=p[j];                p[j]=p[j+1];                p[j+1]=temp;            }        }    }    printf(" Sort complete , Please use the command L see ！\n");}

3.hs.h Storage structure declaration and hs.c The function declaration corresponding to the function inside .

#include <stdio.h>#include <stdlib.h>struct student{    int id;    float yw;    float sx;    float wy;    float pj;};int type(struct student *p);void list(struct student *p,int n);void average(struct student *p,int n);void help(void);void search(struct student *p);void sort(struct student *p,int n);

4.main function

#include <stdio.h>#include <stdlib.h>#include "hs.h"int main(int argc, const char *argv[]){    char ch;    struct student stu[32];    int n=0;    while(1)    {        printf(" Please enter a command  = ");        scanf("%c",&ch);        putchar(10);        if(ch=='T')        {            n=type(stu);        }        else if(ch=='L')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else                list(stu,n);        }        else if(ch=='A')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else            {                average(stu,n);                printf(" The average score has been calculated , Please use the command L see ！\n");                putchar(10);            }        }        else if(ch=='H')            help();        else if(ch=='C')            system("clear");        else if(ch=='S')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else            {                search(stu);                putchar(10);            }        }        else if(ch=='P')        {            if(n==0)            {                printf(" The grade sheet is empty ！ Please use first. T Enter the score ！\n");                putchar(10);            }            else            {                sort(stu,n);                putchar(10);            }        }        else if(ch=='Q')        {            printf("Press any key to continue!\n");            return -1;        }        getchar();    }    return 0;}

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