C语言实现学生成绩管理系统

C语言实现学生成绩管理系统
要求如下：
1、录入记录数据，建立一张数据表，并将数据表写入文件保存；
2、对已经保存在外存中的文件，根据系统内容设计一个计算功能，如计算总和，或平均值等，将结果显示在屏幕上；
3、对已经保存在外存中的文件，根据系统内容设计排序功能，既可以从小到大，又可以从大到小排序，将排序前后的数据表显示在屏幕上；
4、对已经保存在外存中的文件，根据系统内容设计查询功能，查询结果显示在屏幕上；
5、对已经保存在外存中的文件，进行数据记录的删除操作，重新写文件更新；
6、对已经保存在外存中的文件，进行数据记录的插入操作，重新写文件更新；
7、读入文件内容，将数据表输出在屏幕上。

程序需从D盘读出数据，需要在D盘根目录下存入如下格式数据且命名为student：

具体代码如下：

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#define N 10
typedef struct student
{long studentID;char studentName[100];char studentSex[100];char studentClass[100];int score;	}STUDENT; 
int sum1(STUDENT stu[],int n)
{int i,j,sum=0;for(i=0;i<n;i++)sum+=stu[i].score;printf("学科成绩总分及平均分:%d,%d\n",sum,sum/n);printf("\n");return 0;
}
int high1(STUDENT stu[],int n)
{int i,j;long t;char c[100],x[100];printf("成绩由高到低排序\n"); for(i=0;i<n-1;i++)for(j=i+1;j<n;j++)if(stu[j].score>stu[i].score) { t=stu[i].studentID;stu[i].studentID=stu[j].studentID;stu[j].studentID=t;t=stu[i].score;stu[i].score=stu[j].score;stu[j].score=t;strcpy(x,stu[i].studentName);strcpy(stu[i].studentName,stu[j].studentName);strcpy(stu[j].studentName,x);strcpy(c,stu[i].studentSex);strcpy(stu[i].studentSex,stu[j].studentSex);strcpy(stu[j].studentSex,c);strcpy(c,stu[i].studentClass);strcpy(stu[i].studentClass,stu[j].studentClass);strcpy(stu[j].studentClass,c);}for(i=0;i<n;i++){printf("%d ",stu[i].studentID);printf("%s ",stu[i].studentName);printf("%s ",stu[i].studentSex);printf("%s ",stu[i].studentClass);printf("%d ",stu[i].score);printf("\n"); }printf("\n");
return 0;	
}
int low1(STUDENT stu[],int n)
{   int i,j;long t;char c[100],x[100];printf("成绩由低到高排序(格式：学号，成绩)\n"); for(i=0;i<n-1;i++)for(j=i+1;j<n;j++)if(stu[j].score<stu[i].score) { t=stu[i].studentID;stu[i].studentID=stu[j].studentID;stu[j].studentID=t;t=stu[i].score;stu[i].score=stu[j].score;stu[j].score=t;strcpy(x,stu[i].studentName);strcpy(stu[i].studentName,stu[j].studentName);strcpy(stu[j].studentName,x);strcpy(c,stu[i].studentSex);strcpy(stu[i].studentSex,stu[j].studentSex);strcpy(stu[j].studentSex,c);strcpy(c,stu[i].studentClass);strcpy(stu[i].studentClass,stu[j].studentClass);strcpy(stu[j].studentClass,c);}for(i=0;i<n;i++){printf("%d ",stu[i].studentID);printf("%s ",stu[i].studentName);printf("%s ",stu[i].studentSex);printf("%s ",stu[i].studentClass);printf("%d ",stu[i].score);printf("\n"); }printf("\n");
return 0;	
}
int chaxun1(STUDENT stu[],int n)
{   	int i,j,z,t=0;do{printf("请输入查询的学号:");scanf("%d",&z);t=0;for(i=0;i<n;i++)if(z==stu[i].studentID) { t=1; printf("%d ",stu[i].studentID);printf("%s ",stu[i].studentName);printf("%s ",stu[i].studentSex);printf("%s ",stu[i].studentClass);printf("%d ",stu[i].score);break;}if(t==0) printf("无此学号，请重新输入\n"); }while(i==n);printf("\n\n");return 0;
}
int shanchu1(STUDENT stu[],int *n)
{    int z,i,j,t,q=*n;char c[20],x[20];FILE *fp;fp=fopen("D:\\student(s1).txt","wb+");for(i=0;i<*n-1;i++)for(j=i+1;j<*n;j++)if(stu[j].studentID<stu[i].studentID) { t=stu[i].studentID;stu[i].studentID=stu[j].studentID;stu[j].studentID=t;t=stu[i].score;stu[i].score=stu[j].score;stu[j].score=t;strcpy(x,stu[i].studentName);strcpy(stu[i].studentName,stu[j].studentName);strcpy(stu[j].studentName,x);strcpy(c,stu[i].studentSex);strcpy(stu[i].studentSex,stu[j].studentSex);strcpy(stu[j].studentSex,c);strcpy(c,stu[i].studentClass);strcpy(stu[i].studentClass,stu[j].studentClass);strcpy(stu[j].studentClass,c);}do{printf("请输入要删除的学号：");scanf("%d",&z);for(i=0;i<*n;i++)if(z==stu[i].studentID) break;}while(i==*n);for(j=i;j<*n-1;j++){stu[j].studentID=stu[j+1].studentID;strcpy(stu[j].studentName,stu[j+1].studentName);strcpy(stu[j].studentSex,stu[j+1].studentSex);stu[j].score=stu[j+1].score;strcpy(stu[j].studentClass,stu[j+1].studentClass);}*n=*n-1;printf("删除后为：\n");for(i=0;i<*n;i++){printf("%d ",stu[i].studentID);printf("%s ",stu[i].studentName);printf("%s ",stu[i].studentSex);printf("%s ",stu[i].studentClass);printf("%d ",stu[i].score);printf("\n"); }fprintf(fp,"%d\n",*n);for(i=0;i<*n;i++){fprintf(fp,"%d ",stu[i].studentID);fprintf(fp,"%s ",stu[i].studentName);fprintf(fp,"%s ",stu[i].studentSex);fprintf(fp,"%s ",stu[i].studentClass);fprintf(fp,"%d\n",stu[i].score);printf("\n"); }*n=q;fclose(fp);FILE *fq;fq=fopen("D:\\student.txt","rb+");fscanf(fq,"%d",&t);for(i=0;i<t;i++){fscanf(fq, "%ld",&stu[i].studentID);fscanf(fq, "%s",stu[i].studentName);fscanf(fq, "%s",stu[i].studentSex);fscanf(fq, "%s",stu[i].studentClass);fscanf(fq, "%d",&stu[i].score);}fclose(fq);printf("已保存至D盘根目录student(s1).txt\n");return 0; 
}
int charu1(STUDENT stu[],int *n)
{ int z,i,j,t;char c[20],x[20];FILE *fp;fp=fopen("D:\\student(s2).txt","wb+");printf("请输入插入的位置(数字 比如2)：");scanf("%d",&z);for(j=*n;j>z;j--){     stu[j].studentID=stu[j-1].studentID;strcpy(stu[j].studentName,stu[j-1].studentName);strcpy(stu[j].studentSex,stu[j-1].studentSex);strcpy(stu[j].studentClass,stu[j-1].studentClass);stu[j].score=stu[j-1].score;} printf("请输入学号：");scanf("%d",&stu[z].studentID);printf("请输入姓名：");scanf("%s",stu[z].studentName);printf("请输入性别：");scanf("%s",stu[z].studentSex);printf("请输入班级：");scanf("%s",stu[z].studentClass); printf("请输入分数：");scanf("%d",&stu[z].score);*n=*n+1;printf("插入后为：\n");for(i=0;i<*n;i++){printf("%d ",stu[i].studentID);printf("%s ",stu[i].studentName);printf("%s ",stu[i].studentSex);printf("%s ",stu[i].studentClass);printf("%d ",stu[i].score);printf("\n"); }fprintf(fp,"%d\n",*n);for(i=0;i<*n;i++){fprintf(fp,"%d ",stu[i].studentID);fprintf(fp,"%s ",stu[i].studentName);fprintf(fp,"%s ",stu[i].studentSex);fprintf(fp,"%d ",stu[i].studentClass);fprintf(fp,"%d\n",stu[i].score);printf("\n"); }printf("已保存至D盘根目录student(s2).txt\n\n");return 0;
}
int main()
{  printf("学生成绩管理系统\n");FILE *fp;fp=fopen("D:\\student.txt","rb+");STUDENT stu[N],stu1[N];int n,m,i,j,k,s=0,order,t;fscanf(fp,"%d",&n);for(i=0;i<n;i++){fscanf(fp, "%ld",&stu[i].studentID);fscanf(fp, "%s",stu[i].studentName);fscanf(fp, "%s",stu[i].studentSex);fscanf(fp, "%s",stu[i].studentClass);fscanf(fp, "%d",&stu[i].score);}printf("文本数据为:\n"); for(i=0;i<n;i++){printf("%d ",stu[i].studentID);printf("%s ",stu[i].studentName);printf("%s ",stu[i].studentSex);printf("%s ",stu[i].studentClass);printf("%d ",stu[i].score);printf("\n"); }printf("\n"); int (*sum)(STUDENT stu[],int n);int (*low)(STUDENT stu[],int n);int (*high)(STUDENT stu[],int n);int (*chaxun)(STUDENT stu[],int n);int (*shanchu)(STUDENT stu[],int *n);int (*charu)(STUDENT stu[],int *n);sum=sum1;high=high1;low=low1;chaxun=chaxun1;shanchu=shanchu1;charu=charu1;printf("输入“1”计算总分和平均分\n");	printf("输入“2”给出成绩降序表\n");	printf("输入“3”给出成绩升序表\n");	printf("输入“4”按学号查询学生排名及成绩\n");printf("输入“5”删除相应学号数据\n");printf("输入“6”插入相应学号数据\n");printf("输入“7”计算所有\n");printf("输入“8”结束程序\n");printf("---------------------1 --------------------\n");printf("请输入：");scanf("%d",&k);printf("\n");while(1){switch(k){case 1:(*sum)(stu,n);break;case 2:(*high)(stu,n);break;case 3:(*low)(stu,n);break;case 4:(*chaxun)(stu,n);break;case 5:(*shanchu)(stu,&n);break;case 6:(*charu)(stu,&n);break;case 7: {(*sum)(stu,n);(*high)(stu,n);(*low)(stu,n);(*chaxun)(stu,n);(*shanchu)(stu,&n);(*charu)(stu,&n);break;} case 8:break;}if(k==8)break;printf("请输入要执行的数字:");scanf("%d",&k); }	fclose(fp);return 0;
} 

程序结果如下