C语言学生成绩管理系统的开发

1、菜单：for(i=0;i&盟敢势袂lt;66;i++) printf("*"); printf("\荏鱿胫协n"); printf("1.Input record\n"); printf("2.Caculate totel and average score of every course\n"); printf("3.Caculate totel and average score of every student\n"); printf("4.Sort in descending order by total score of every student\n"); printf("5.Sort in ascending order by total score of every student\n"); printf("6.Sort in ascending order by number\n"); printf("7.Sort in ascending order by name\n"); printf("8.Search by number\n"); printf("9.Search by name\n"); printf("10.Statistic analysis for every course\n"); printf("11.List record\n"); printf("12.Write to a file\n"); printf("13.Read from a file\n"); printf("0.Exit\n"); for(i=0;i<66;i++) printf("*"); printf("\n"); printf("Please enter your choice:");printf("\n");

2、输入函数：void Readscore (STU stu[],int n,int m) //1.输入数据{ int i,j; for(i=0;i<n;i++) { printf("Input student's ID ,name and score"); scanf("%ld",&stu[i].studentID); scanf("%s",stu[i].studentName); for(j=0;j<m;j++) scanf("%d",&stu[i].score[j]); }}

3、数据处理函数：void Tota (STU stu[],int n,int m) //2.计算每门课程的总分和平均分{ int i,j,sum[M]; double ave[M]; for(j=0;j<m;j++) { sum[j]=0; for(i=0;i<n;i++) { sum[j]=sum[j]+stu[i].score[j]; } ave[j]=(double)sum[j]/n; } for(i=0;i<m;i++) printf("Project %d 总分=%d,课程的平均分=%f\n",i+1,sum[i],ave[i]);}void Datasort_1 (STU stu[],int n,int m) //3.计算每个学生的总分和平均分{ int i,j,sum[N]; double ave[N]; for(i=0;i<n;i++) { sum[i]=0; for(j=0;j<m;j++) { sum[i]=sum[i]+stu[i].score[j]; } ave[i]=(double)sum[i]/m; } for(i=0;i<n;i++) printf("ID:%10ld,Name: %s Allscore=%d,The ave=%f\n",stu[i].studentID,stu[i].studentName,sum[i],ave[i]);}

4、排序函墙绅褡孛数：void Datasort_2 (STU stu[],int n,int m) //4.按每个学生的总分由高到低排出名次表{ int i,j,k,h,sum[N]; STU t; for(i=0;i<n;i++) { sum[i]=0; for(j=0;j<m;j++) { sum[i]=sum[i]+stu[i].score[j]; } } for(i=0;i<n;i++) { k=i; for(j=i+1;j<n;j++) { if (sum[j]>sum[k]) k=j; } if(i!=k) { t=stu[i],h=sum[i]; stu[i]=stu[k],sum[i]=sum[k]; stu[k]=t,sum[k]=h; } } for(i=0;i<n;i++) printf("ID:%10ld,Name:%s,Score:%d\n",stu[i].studentID,stu[i].studentName,sum[i]);}void Datasort_3 (STU stu[],int n,int m) //5.按每个学生的总分由低到高排出名次表{ int i,j,k,h,sum[N]; STU t; for(i=0;i<n;i++) { sum[i]=0; for(j=0;j<m;j++) { sum[i]=sum[i]+stu[i].score[j]; } } for(i=0;i<n;i++) { k=i; for(j=i+1;j<n;j++) { if (sum[j]<sum[k]) k=j; } if(i!=k) { t=stu[i],h=sum[i]; stu[i]=stu[k],sum[i]=sum[k]; stu[k]=t,sum[k]=h; } } for(i=0;i<n;i++) printf("ID:%10ld,Name:%s,score:%d\n",stu[i].studentID,stu[i].studentName,sum[i]);}void Datasort_4 (STU stu[],int n,int m) //6.按学号由小到大排出名次表{ int i,j,k; STU t; for(i=0;i<n;i++) { k=i; for(j=i+1;j<n;j++) { if (stu[j].studentID<stu[k].studentID) k=j; } if(i!=k) t=stu[k],stu[k]=stu[i],stu[i]=t; } for(i=0;i<n;i++) { printf("ID:%10ld,Name:%s\n",stu[i].studentID,stu[i].studentName); for(j=0;j<m;j++) printf("Project %d Score:%d\n",j+1,stu[i].score[j]); }}

5、数倌栗受绽据分析函数：void Statistis (STU stu[],int n,int m) //10.{ int i,j,c泠贾高框ount_1,count_2,count_3,count_4,count_5; for(j=0;j<m;j++) { count_1=0,count_2=0,count_3=0,count_4=0,count_5=0; for(i=0;i<n;i++) { if(stu[i].score[j]>=90) count_1++; else if(stu[i].score[j]>=80) count_2++; else if(stu[i].score[j]>=70) count_3++; else if(stu[i].score[j]>=60) count_4++; else count_5++; } printf("project %d\n",j+1); printf("优秀:%d\t优秀率:%f%\n",count_1,(float)count_1/n); printf("良好:%d\t良好率:%f%\n",count_2,(float)count_2/n); printf("中等:%d\t中等率:%f\n",count_3,(float)count_3/n); printf("及格:%d\t及格率:%f\n",count_4,(float)count_4/n); printf("不及格:%d\t不及格率:%f\n",count_5,(float)count_5/n); }}

6、数据界面打印函数：void List (STU stu[],int n,int m) //11.{ int i,j,sum[N]; double ave[N]; for(i=0;i<n;i++) { sum[i]=0; for(j=0;j<m;j++) { sum[i]=sum[i]+stu[i].score[j]; } ave[i]=(double)sum[i]/m; } for(i=0;i<n;i++) { printf("ID:%10ld,Name:%s\n",stu[i].studentID,stu[i].studentName); for(j=0;j<m;j++) { printf("Score %d :%d\n",j+1,stu[i].score[j]); } printf("Allscore=%d\n平均分%f\n",sum[i],ave[i]); }}

7、文件处理函数：void WritetoFile(STU stu[],int n,int m) //将每个学生的记录信息写入文件{ Tota(stu,n,m); Datasort_2 (stu,n,m); FILE *fp; if((fp=fopen("student.txt","w"))==NULL) { printf("Failure to open student.txt!\n"); exit(0); } fwrite(stu,sizeof(STU),n,fp); fclose(fp);}int ReadfromFile(STU stu[],int n,int m)//从文件中读出每个学生的记录信息并显示{ FILE *fp; int i; if((fp=fopen("student.txt","r"))==NULL) { printf("Failure to open student.txt!\n"); exit(0); } for(i=0;!feof(fp);i++) { fread(&stu[i],sizeof(STU),1,fp); } fclose(fp); printf("Total student is %d.\n",i-1); n=i-1; List(stu,n,m); //输出从文件中读出的信息到屏幕上return i-1;}