C语言实现简单班级成绩管理系统
前言:
有朋友最近在做c语言课设,要求写一个班级成绩管理系统,便写份简单的代码来玩。代码原创,未参考任何其他人的代码
程序要求
说明
- 本程序主要采用结构体数组
- 本文件采用多文件编写,由于程序规模小,故未采用编写头文件的方式
- 使用 #pragma once 来防止头文件重复包含
代码
怎么使用本程序看看注释应该就知道了。run main.c 就行。其他各文件作用:
- def.c 定义了一些常量和全局变量,结构体
- myIO.c 实现了成绩录入和成绩打印输出
- file.c 实现了将成绩保存为文件
- menu.c 实现了菜单功能
- function.c 包含其他一些要用的函数
main.c
#include "menu.c" int main() { select(); return 0; }
def.c
// 相同头文件只包含一次,后不赘述 #pragma once #include <stdio.h> #include <stdlib.h> #include <string.h> #define OK 1 #define ERROR 0 #define TRUE 1 #define FALSE 0 #define Status int // 课程 typedef struct Course { char name[30]; int score; } Course, *pCourse; // 学生 typedef struct Student { char number[30]; char name[30]; pCourse pC; } Student, *pStudent; // n是学生数, m是课程数 int n, m; char courseName[30], studentName[30], course[20][30]; pStudent pS = NULL;
myIO.c
#pragma once #include "def.c" pStudent inputStudentInfo(void); void printStudentInfo(pStudent pS); // 录入学生信息 pStudent inputStudentInfo(void) { int i, j; printf("Please input the number of students and courses: "); scanf("%d %d", &n, &m); printf("Please input the name of courses: "); for (i = 0; i < m; i++) { scanf("%s", course[i]); } pStudent pS = (pStudent)malloc(sizeof(Student) * n); if (!pS) return NULL; printf("Please input the info: \n"); for (i = 0; i < n; i++) { pS[i].pC = (pCourse)malloc(sizeof(Course) * m); if (!pS[i].pC) return NULL; scanf("%s %s", pS[i].name, pS[i].number); for (j = 0; j < m; j++) { strcpy(pS[i].pC[j].name, course[j]); scanf("%d", &pS[i].pC[j].score); } } return pS; } // 打印所有学生信息 void printStudentInfo(pStudent pS) { int i, j; // 打印标题 printf("Name\tnumber\t"); for (i = 0; i < m - 1; i++) printf("%s\t", course[i]); printf("%s\n", course[i]); // 显示信息 for (i = 0; i < n; i++) { printf("%s\t%s\t", pS[i].name, pS[i].number); for (j = 0; j < m - 1; j++) printf("%d\t", pS[i].pC[j].score); printf("%d\n", pS[i].pC[j].score); } }
file.c
#pragma once #include "def.c" Status saveStudentInfo(pStudent pS); Status saveStudentInfo(pStudent pS) { FILE *fp; int i, j; char filename[30], str[100] = "student number"; printf("please input the filename: "); scanf("%s", filename); fp = fopen(filename, "w"); if (!fp) return ERROR; for (i = 0; i < m; i++) { strcat(str, " "); strcat(str, course[i]); } strcat(str, "\n"); for (i = 0; i < n; i++) { strcat(str, pS[i].name); strcat(str, " "); strcat(str, pS[i].number); for (j = 0; j < m; j++) { char score[30]; itoa(pS[i].pC[j].score, score, 10); strcat(str, " "); strcat(str, score); } strcat(str, "\n"); } fputs(str, fp); fclose(fp); return OK; }
menu.c
#pragma once #include "def.c" #include "myIO.c" #include "file.c" #include "function.c" void menu(); void select(); // 菜单 void menu() { printf("------------------------------------\n"); printf("| Menu |\n"); printf("| 1. input |\n"); printf("| 2. show |\n"); printf("| 3. save |\n"); printf("| 4. sort |\n"); printf("| 5. modify |\n"); printf("| 6. count |\n"); printf("| 0. exit |\n"); printf("------------------------------------\n"); } void select() { int branch; while (TRUE) { system("cls"); menu(); printf("[Input]: "); scanf("%d", &branch); if (!branch) break; switch (branch) { case 1: { pS = inputStudentInfo(); if (pS == NULL) printf("input error! please input again\n"); else printf("Input success!\n"); system("pause"); break; } case 2: { printStudentInfo(pS); system("pause"); break; } case 3: { if (OK == saveStudentInfo(pS)) printf("Save success!\n"); else printf("Save fail!\n"); system("pause"); break; } case 4: { sort(pS); printf("sort success\n"); system("pause"); break; } case 5: { int res = modify(pS); if (res) { printf("change success!\n"); } else { printf("change fail!\n"); } system("pause"); break; } case 6: { int choose; // 输入1 显示每门课程最高成绩信息 // 输入2 显示每门课程平均成绩信息 printf("choose 1 for the highest score: \n "); printf("choose 2 for the average score: \n"); printf("[Input]: "); scanf("%d", &choose); if (choose == 1) { showMax(pS); } else if (choose == 2) { showAverage(pS); } else { // 输入非法提示信息 printf("Input error!\n"); } system("pause"); break; } } } }
function.c
#include "def.c" void sort(pStudent pS); void Swap(pStudent s1, pStudent s2); void showAverage(pStudent pS); void showMax(pStudent pS); Status modify(pStudent pS); // 按课程成绩排序 void sort(pStudent pS) { int courseNumber, i, j, k; char courseName[30]; printf("please input the course name which you want to sort: "); scanf("%s", courseName); for (courseNumber = 0; courseNumber < m; courseNumber++) if (strcmp(course[courseNumber], courseName) == 0) break; // 如果找不到课程,则认为是按总分排序 if (courseNumber == m) { printf("Sort as total score: \n"); // 选择排序 for (i = 0; i < n - 1; i++) { int flag = i; for (j = i + 1; j < n; j++) { int totalScore_1 = 0, totalScore_2 = 0; for (k = 0; k < m; k++) { totalScore_1 += pS[j].pC[k].score; totalScore_2 += pS[flag].pC[k].score; } if (totalScore_1 > totalScore_2) { flag = j; } } Swap(&pS[i], &pS[flag]); } } else { // 选择排序 for (i = 0; i < n - 1; i++) { int flag = i; for (j = i + 1; j < n; j++) { if (pS[j].pC[courseNumber].score > pS[flag].pC[courseNumber].score) { flag = j; } } Swap(&pS[i], &pS[flag]); } } } // 修改学生信息 Status modify(pStudent pS) { // 密码是1314 char password[30] = "1314", psd[30]; char number[30]; int score, i, j; printf("please input password: "); scanf("%s", psd); // 密码正确才继续,否则返回ERROR if (strcmp(password, psd) == 0) { printf("please input the student's number: "); scanf("%s", number); for (i = 0; i < n; i++) { // 找到学生则继续,否则返回ERROR if (strcmp(pS[i].number, number) == 0) { printf("please input the course and score one by one: \n"); scanf("%s %d", courseName, &score); for (j = 0; j < m; j++) { // 找到课程才继续,否则返回ERROR if (strcmp(pS[i].pC[j].name, courseName) == 0) { // 修改课程成绩 pS[i].pC[j].score = score; return OK; } } return ERROR; } } return ERROR; } else return ERROR; } // 输出各课程最高分的学生 void showMax(pStudent pS) { int i, j, max; for (i = 0; i < m; i++) { max = 0; for (j = 0; j < n; j++) { if (pS[j].pC[i].score > pS[max].pC[i].score) max = j; } printf("%s\t%s\t%s\t%d\n", course[i], pS[max].name, pS[max].number, pS[max].pC[i].score); } } // 显示各课程的平均成绩 void showAverage(pStudent pS) { int i, j; double ave; for (i = 0; i < m; i++) { ave = 0; for (j = 0; j < n; j++) { ave += pS[j].pC[i].score; } printf("%s\t%.2lf\n", course[i], ave / n); } } void Swap(pStudent s1, pStudent s2) { int i; char studentName[30], number[30]; // 交换姓名 strcpy(studentName, s1->name); strcpy(s1->name, s2->name); strcpy(s2->name, studentName); // 交换学号 strcpy(number, s1->number); strcpy(s1->number, s2->number); strcpy(s2->number, number); // 交换成绩 for (i = 0; i < m; i++) { int temp = s1->pC[i].score; s1->pC[i].score = s2->pC[i].score; s2->pC[i].score = temp; } }
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