[C language] Simple score management system (Codeblocks)
Preface
The school’s program design exercises, as soon as the school starts, let us make a simple score management system. Everyone is stupid.
This project is divided into five different files to achieve. The following will post one by one
. The file format in the score.txt is:
(for example )
Student number grade score
01 A 100
ps: only for learning and communication reference
1. Main menu program
The code is as follows (using switch to call each module):
/*实验内容：
—已知59人的程序设计基础课程成绩，
完成：
（1）定义数组存储成绩
（2）从文件读取数据实现存储
（3）按照成绩升序排列输出成绩
（4）按照优、良、中、及格、不及格进行分类输出成绩。
（5）输入一等级，输出该等级内的所有成绩。
（6）设计主程序菜单，完成上述各算法的测试调用
—实验要求：
完成上述问题的：算法分析与设计，程序编写和测试。
并提交最终实验报告和程序源码。*/
/* ※@rain_HYS※ 编写，仅供参考学习交流还有交作业使用 */
#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#define N 59 /*总人数不超过59*/
void SaveScore();
void RankScore();
void ClassifyScore();
void SearchScore();
struct student /*定义结构体存储成绩*/
{
int num;
char stname[20];
int score;
}stu[N];
int main(void)
{
int allnum; /*主程序读取用户输入数字*/
char tf;
printf("\n------- BUA ※ 成绩管理系统 ※ rain_hys编写 -------\n"
"\n------- 该程序目前具有以下功能： -------\n"
"\n------- （1）从文件存入成绩 -------\n"
"\n------- （2）按照成绩升序排列输出成绩 -------\n"
"\n-------（3）按照优、良、中、及格、不及格进行分类输出成绩 -------\n"
"\n------- （4）输入一等级，输出该等级内的所有成绩 -------\n"); /*程序菜单，后期可改*/
do
{
printf("\n请输入想要运行的程序的数字编号：\n");
scanf("%d",&allnum);
switch(allnum)
{
case 1:
SaveScore();
break;
case 2:
RankScore();
break;
case 3:
ClassifyScore();
break;
case 4:
SearchScore();
break;
case 813:
printf("@rain_HYS\n"
"恭喜你发现彩蛋！！\n");
break;
default:
printf("输入错误字符，请重新运行程序！\n");
break;
}
printf("是否重新运行程序？(Y&N)\n");
scanf("%s",&tf);
}
while(tf == 'Y' || tf == 'y');
return 0;
}
2. Save data from file
code show as below:
#include <stdio.h>
#include <stdlib.h>
#define N 59
struct student /*定义结构体存储成绩*/
{
int num;
char stname[20];
int score;
}stu[N]; /*总人数不超过59*/
void SaveScore()
{
FILE *fp; /*定义头文件*/
int i;
if((fp=fopen("成绩.txt","r"))==NULL) /*打开路径文件*/
{
printf("文件打开失败，请检查输入路径是否正确！\n");
exit (0);
}
for(i=0; i<N; i++) /*文件处理（逐个读入和处理数据）*/
{
fscanf(fp,"%d %s %d",&stu[i].num, &stu[i].stname, &stu[i].score); /*从文件读入成绩保存到变量*/
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score); /*输出成绩到屏幕*/
}
printf("成绩录入完毕！\n");
3. Sort the output results in ascending order (bubble sort)
The code is as follows (drawing from the bubbling sorting algorithm of the CSDN boss, and finally successfully written it ※ gratifying, congratulating, gratifying, gratifying ※):
#include<stdio.h>
#include<stdlib.h>
#define N 59
struct student /*学生结构体*/
{
int num;
char stname[20];
int score;
} stu[N];
void RankScore()
{
FILE *fp; /*定义头文件*/
int i,j,k; /*定义整型变量*/
struct student t;
if(stu[1].num == 0) /*提示用户先运行程序：从文件存入成绩*/
{
printf("Warning！\n"
"你还未存入文件！\n"
"请先运行功能1：从文件存入成绩\n");
return 0;
}
printf("成绩由小到大排序：\n");
for(i=0; i<N-1; i++) /*外层for循环*/
{
k=i; /*把i的值赋给k*/
for(j=i+1; j<N; j++) /*内层for循环*/
{
if(stu[j].score<stu[k].score)/*挑出分数低的*/
{
k=j; /*把相应的j赋值给k*/
}
}
t=stu[k]; /*把成绩低的放到前面*/
stu[k]=stu[i];
stu[i]=t;
}
for(i=0; i<N; i++) /*循环输出成绩*/
{
printf("%d %s %d\n",stu[i].num,stu[i].stname,stu[i].score);
}
}
4. Classify and output the results according to excellent, good, intermediate, pass, and fail
code show as below:
#include<stdio.h>
#include<stdlib.h>
#define N 59
struct student /*学生结构体*/
{
int num;
char stname[20];
int score;
} stu[N];
void ClassifyScore()
{
FILE *fp; /*定义头文件*/
int i;
if(stu[1].num == 0) /*提示用户先运行程序：从文件存入成绩*/
{
printf("Warning！\n"
"你还未存入文件！\n"
"请先运行功能1：从文件存入成绩\n");
return 0;
}
printf("输出优秀名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 90)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
printf("输出良好名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 80 && stu[i].score < 90)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
printf("输出中等名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 70 && stu[i].score < 80)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
printf("输出及格名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 60 && stu[i].score < 70)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
printf("输出不及格名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score < 60)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
}
5. Enter a level and output all the results in that level
code show as below:
#include<stdio.h>
#include<stdlib.h>
#define N 59
struct student /*学生结构体*/
{
int num;
char stname[20];
int score;
} stu[N];
void SearchScore()
{
FILE *fp; /*定义头文件*/
int i;
char usernum; /*用户的输入字母*/
if(stu[1].num == 0) /*提示用户先运行程序：从文件存入成绩*/
{
printf("Warning！\n"
"你还未存入文件！\n"
"请先运行功能1：从文件存入成绩\n");
return 0;
}
printf("请输入想要查找的等级：（从A~E）\n");
scanf("%s",&usernum);
if(usernum == 'A' || usernum == 'a')
{
printf("输出优秀名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 90)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
}
else if(usernum == 'B'|| usernum == 'b')
{
printf("输出良好名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 80 && stu[i].score < 90)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
}
else if(usernum == 'C'|| usernum == 'c')
{
printf("输出中等名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 70 && stu[i].score < 80)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
}
else if(usernum == 'D'|| usernum == 'd')
{
printf("输出及格名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score >= 60 && stu[i].score < 70)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
}
else if(usernum == 'E'|| usernum == 'e')
{
printf("输出不及格名单：\n");
for(i=0; i<N; i++)
{
if(stu[i].score < 60)
{
printf("%d %s %d\n",stu[i].num, stu[i].stname, stu[i].score);
}
}
}
else
{
printf("输入错误字符，请重新输入！\n");
}
}
to sum up
Successfully run! 
It's not easy. It's not easy
. Only the screenshots of function 1 will be posted here.
Thank you CSDN big guy @份大碗宽面 for your inspiration!
Learning to code is really not an easy task, if there is something badly written, please forgive me