学生管理系统实训

#include<stdio.h>
#include<Windows.h>
#include<conio.h>
#define StudentNumber 30             //Maximum number of students
#define SubjectNumber 6              //Maximum number of subjects
#define NameLength 20                //Maximum number of name_length
typedef struct student{
    long int num;
    char name[NameLength];
    float score[SubjectNumber];
    float sum;
}STU;
STU s[StudentNumber];
int itemSelected=-1;
int n;                               //StudentNumber
int m;                               //SubjectNumber
void inputScore();                   //Enter basic information
void SortByGrade();
void printScore();
int Menu(){
    system("cls");
    printf("\n ==============Student achievement management system===============\n");
    printf("\t 1.Enter your student id number, name and grade for each subject\n");
    printf("\t 2.A league table is arranged according to each student's total score from highest to lowest\n");
    printf("\t 3.Output information about each student\n");
    printf("\t 0.Quit\n");
    printf("======================================================================\n");
    printf("Please select options:");
    scanf( "%d",&itemSelected);
    system("cls");
    return itemSelected;
}
void chose(int a){
    switch(a){
        case 1: inputScore(); break;
        case 2: SortByGrade();break;
        case 3: printScore();break;
        case 0: printf("About to exit program");
            exit(0);
        default: printf("Input error!");break;
    }
}
int main()
{
    char a;
    printf("Please enter the total number of students(n<%d):\n",StudentNumber);
    scanf("%d",&n);
    getchar();
    printf("Please enter the total number of subjects(m<%d):\n",SubjectNumber);
    scanf("%d",&m);
    getchar();
    system("cls");
    while(1){
        itemSelected=Menu();
        chose(itemSelected);
    }
}
void inputScore(){
    printf("\n===============================================\n");
    printf("Please input student ID, name and subject information (enter 0 to stop information input) \n");
    int i,j;
    for(i=0;i<n;i++){
        printf("Student id (8):");
        scanf("%ld",&s[i].num);
        if(s[i].num==0) break;
        getchar();
        printf("Name:");
        gets(s[i].name);
        printf("Please enter your scores for each subject:");
        s[i].sum=0;
        for(j =0;j<m;j++){
            scanf("%f",&s[i].score[j]);
            s[i].sum +=s[i].score[j];
        }
        system("cls");
    }
}
void SortByGrade(){                                       //Sorted from highest to lowest overall score
    STU temp;
    int i,j,k;
    for(i=0;i<n;i++)
    {
        for(j=0;j<n;j++)
        {      if(s[j].sum<s[j+1].sum){
                temp=s[j];
                s[j]=s[j+1];
                s[j+1]=temp;
            }
        }
    }
    printf("\n============Sorted from highest to lowest overall score===========\n");
    for(j=0;j<n;j++){
        printf("The overall score ranking %d is:",j+1);
        for(k=0;k<NameLength;k++){
            printf("%c",s[j].name[k]);
        }
        printf("\nThe student's total score is:%.2f\n",s[j].sum);
    }
    getch();
}
void printScore(){
    printf("==============Below is the student information==============\n");
    int j,k,c;
    for(j=0;j<n;j++){
        printf("The student's student id is:%ld\n",s[j].num);
        printf("The student's name is:");
        for(k=0;k<NameLength;k++){
            printf("%c",s[j].name[k]);
        }
        printf("\nA student's scores for each subject is:\n");
        for(c=0;c<m;c++){
            printf("The %d subject score is:%.2f\n",c+1,s[j].score[c]);
        }
        printf("The student's total score is:%.2f",s[j].sum);
        printf("\n");
    }
    getch();
}