#include<stdlib.h>
#include<string.h>
#define MAX_LEN 10
#define STU_NUM 30
#define COURSE_NUM 6
typedef struct student
{
long num;
char name[MAX_LEN];
float score[COURSE_NUM];
float sum;
float aver;
}STU;
int Menu(void);
void ReadScore(STU stu[],int n,int m);
void AverSumofEveryStudent(STU stu[],int n,int m);
void AverSumofEveryCourse(STU stu[],int n,int m);
void SortbyScore(STU stu[],int n,int m,int (*compare)(float a,float b));
int Ascending(float a,float b);
int Descending(float a,float b);
void SwapFloat(float *x,float *y);
void SwapLong(long *x,long *y);
void SwapChar(char x[],char y[]);
void AsSortbyNum(STU stu[],int n,int m);
void SortbyName(STU stu[],int n,int m);
void SearchbyNum(STU stu[],int n,int m);
void SearchbyName(STU stu[],int n,int m);
void StatisticAnalysis(STU stu[],int n,int m);
void PrintScore(STU stu[],int n,int m);
void WritetoFile(STU record[],int n,int m);
void ReadfromFile(STU record[],int *n,int *m);
int main()
{
char ch;
int n=0,m=0;
STU stu[STU_NUM];
while(1)
{
ch=Menu();
switch (ch)
{
case 1:printf("Input student number(n<=%d):",STU_NUM);
scanf("%d",&n);
printf("Input course number(m<=%d):",COURSE_NUM);
scanf("%d",&m);
ReadScore(stu,n,m);
break;
case 2:AverSumofEveryCourse(stu,n,m);
break;
case 3:AverSumofEveryStudent(stu,n,m);
break;
case 4:SortbyScore(stu,n,m,Descending);
printf("\nSort in descending order by score:\n");
PrintScore(stu,n,m);
break;
case 5:SortbyScore(stu,n,m,Ascending);
printf("\nSort in ascending order by score:\n");
PrintScore(stu,n,m);
break;
case 6:AsSortbyNum(stu,n,m);
printf("\nSort in ascending order by score:\n");
PrintScore(stu,n,m);
break;
case 7:SortbyName(stu,n,m);
printf("\nSort in dictionary order by score:\n");
PrintScore(stu,n,m);
break;
case 8:SearchbyNum(stu,n,m);
break;
case 9:SearchbyName(stu,n,m);
break;
case 10:StatisticAnalysis(stu,n,m);
break;
case 11:PrintScore(stu,n,m);
break;
case 12:WritetoFile(stu,n,m);
break;
case 13:ReadfromFile(stu,&n,&m);
break;
case 14:printf("End of program!\n");
exit(0);
default :printf("Input error!\n");
}
}
return 0;
}
/*函數功能：顯示菜單並獲得用戶鍵盤輸入的選項*/
int Menu(void)
{
int itemSelected;
printf("Management for Students' scores\n");
printf("1.Input record\n");
printf("2.Caculate total and average score of every course \n");
printf("3.Caculate total and average score of every student \n");
printf("4.Sort in descending order by score \n");
printf("5.Sort in ascending order by score \n");
printf("6.Sort in ascending order by number \n");
printf("7.Sort in dictionary order by name \n");
printf("8.Search by number \n");
printf("9.Search by name \n");
printf("10.Statistic analysis \n");
printf("11.List record \n");
printf("12.write to a file \n");
printf("13.read from a file \n");
printf("0.Exit \n");
printf("Please Input your choice:"); //讀入用戶輸入
scanf("%d",&itemSelected);
return itemSelected;
}
/*函數功能：輸入n個學生的m門課程成績*/
void ReadScore(STU stu[],int n,int m)
{
int i,j;
printf("Input students' ID,name and score:\n");
for(i=0;i<n;i++)
{
scanf("%ld%s",&stu[i].num,stu[i].name);
for(j=0;j<m;j++)
{
scanf("%f",&stu[i].score[j]);
}
}
}
/*函數功能：計算每個學生各門課程的總分和平均分*/
void AverSumofEveryStudent(STU stu[],int n,int m)
{
int i,j;
for(i=0;i<n;i++)
{
stu[i].sum=0;
for(j=0;j<m;j++)
{
stu[i].sum=stu[i].sum+stu[i].score[j];
}
stu[i].aver=m>0?stu[i].sum/m:-1;
printf("student %d: sum = %.0f,aver = %.0f\n",
i+1,stu[i].sum,stu[i].aver);
}
}
/*函數功能：計算每門課程的總分和平均分*/
void AverSumofEveryCourse(STU stu[],int n,int m)
{
int i,j;
float sum[COURSE_NUM],aver[COURSE_NUM];
for(j=0;j<m;j++)
{
sum[j]=0;
for(i=0;i<n;i++)
{
sum[j]=sum[j]+stu[i].score[j];
}
aver[j] = n>0 ? sum[j]/n:-1;
printf("course %d:sum = %.0f,aver = %.0f\n",j+1,sum[j],aver[j]);
}
}
/*函數功能：按選擇法將數組sum中的元素值排序*/
void SortbyScore(STU stu[],int n,int m,int (*compare)(float a,float b))
{
int i,j,k,t;
for(i=0;i<n-1;i++)
{
k=i;
for(j=i+1;j<n;j++)
{
if((*compare)(stu[j].sum,stu[k].sum)) k=j;
}
if(k!=i)
{
for(t=0;t<m;t++)
{
SwapFloat(&stu[k].score[t],&stu[i].score[t]);
}
SwapFloat(&stu[k].sum,&stu[i].sum);
SwapFloat(&stu[k].aver,&stu[i].aver);
SwapLong(&stu[k].num,&stu[i].num);
SwapChar(stu[k].name,stu[i].name);
}
}
}
/*使數據按升序排序*/
int Ascending(float a,float b)
{
return a<b;
}
/*使數據按降序排序*/
int Descending(float a,float b)
{
return a>b;
}
/*交換兩個單精度浮點型數據*/
void SwapFloat(float *x,float *y)
{
float temp;
temp=*x;
*x=*y;
*y=temp;
}
/*交換兩個長整形數據*/
void SwapLong(long *x,long *y)
{
long temp;
temp=*x;
*x=*y;
*y=temp;
}
/*交換兩個字符串*/
void SwapChar(char x[],char y[])
{
char temp[MAX_LEN];
strcpy(temp,x);
strcpy(x,y);
strcpy(y,temp);
}
/*函數功能：按選擇法將數組num的元素值按從低到排高序*/
void AsSortbyNum(STU stu[],int n,int m)
{
int i,j,k,t;
for(i=0;i<n-1;i++)
{
k=i;
for(j=i+1;j<n;j++)
{
if(stu[j].num < stu[k].num) k=j;
}
if(k!=i)
{
for(t=0;t<m;t++)
{
SwapFloat(&stu[k].score[t],&stu[i].score[t]);
}
SwapFloat(&stu[k].sum,&stu[i].sum);
SwapFloat(&stu[k].aver,&stu[i].aver);
SwapLong(&stu[k].num,&stu[i].num);
SwapChar(stu[k].name,stu[i].name);
}
}
}
/*函數功能：交換法實現字符串按字典順序排序*/
void SortbyName(STU stu[],int n,int m)
{
int i,j,t;
for(i=0;i<n-1;i++)
{
for(j=i+1;j<n;j++)
{
if(strcmp(stu[j].name, stu[i].name)<0)
{
for(t=0;t<m;t++)
{
SwapFloat(&stu[i].score[t],&stu[j].score[t]);
}
SwapFloat(&stu[i].sum,&stu[j].sum);
SwapFloat(&stu[i].aver,&stu[j].aver);
SwapLong(&stu[i].num,&stu[j].num);
SwapChar(stu[i].name,stu[j].name);
}
}
}
}
/*函數功能：按學號查找學生成績並顯示查找結果*/
void SearchbyNum(STU stu[],int n,int m)
{
long number;
int i,j;
printf("Input the number you want to search");
scanf("%ld",&number);
for(i=0;i<n;i++)
{
if(stu[i].num==number)
{
printf("%ld \t%s \t",stu[i].num,stu[i].name);
for(j=0;j<m;j++)
{
printf("%.0f \t",stu[i].score[j]);
}
printf("%.0f\t%.0f\n",stu[i].sum,stu[i].aver);
return;
}
}
printf("\n Not Found! \n");
}
/*函數功能：按姓名的字典順序排出成績表*/
void SearchbyName(STU stu[],int n,int m)
{
char x[MAX_LEN];
int i,j;
printf("Input the number you want to search");
scanf("%s",x);
for(i=0;i<n;i++)
{
if(strcmp(stu[i].name,x)==0)
{
printf("%ld \t%s \t",stu[i].num,stu[i].name);
for(j=0;j<m;j++)
{
printf("%.0f \t",stu[i].score[j]);
}
printf("%.0f\t%.0f\n",stu[i].sum,stu[i].aver);
return;
}
}
printf("\n Not Found! \n");
}
/*函數功能：統計各分數段的學生人數及所占的百分比*/
void StatisticAnalysis(STU stu[],int n,int m)
{
int i,j,total,t[6];
for(j=0;j<m;j++)
{
printf("For course %d:\n",j+1);
memset(t,0,sizeof(t)); //將數組t的全部元素初始化為0
for(i=0;i<n;i++)
{
if(stu[i].score[j]>=0&&stu[i].score[j]<60) t[0]++;
else if (stu[i].score[j]<70) t[1]++;
else if (stu[i].score[j]<80) t[2]++;
else if (stu[i].score[j]<90) t[3]++;
else if (stu[i].score[j]<100) t[4]++;
else if (stu[i].score[j]=100) t[5]++;
}
for(total=0,i=0;i<=5;i++)
{
total=total+t[i];
}
for(i=0;i<=5;i++)
{
if(i==0) printf("<60\t%d\t%.2f%%\n",t[i],(float)t[i]/n*100);
else if(i==5)
printf("%d\t%d\t%.2f%%\n",(i+5)*10,t[i],(float)t[i]/n*100);
else
printf("%d-%d\t%d\t%.2f%%\n",(i+5)*10,(i+5)*10+9,t[i],(float)t[i]/n*100);
}
}
}
/*函數功能：打印學生成績*/
void PrintScore(STU stu[],int n,int m)
{
int i,j;
for(i=0;i<n;i++)
{
printf("%ld\t%s\t",stu[i].num,stu[i].name);
for(j=0;j<m;j++)
{
printf("%.0f\t",stu[i].score[j]);
}
printf("%.0f\t%.0f\n",stu[i].sum,stu[i].aver);
}
}
/*輸出n個學生的學號，姓名及m門課程的成績到文件student.txt中*/
void WritetoFile(STU stu[],int n,int m)
{
FILE *fp;
int i,j;
if((fp=fopen("student.txt","w"))==NULL)
{
printf("Failure to open score.txt!\n");
exit(0);
}
fprintf(fp,"%d\t%d\n",n,m); //將學生人數和課程門數寫入文件
for(i=0;i<n;i++)
{
fprintf(fp,"%10ld%10s",stu[i].num,stu[i].name);
for(j=0;j<m;j++)
{
fprintf(fp,"%10.0f",stu[i].score[j]);
}
fprintf(fp,"%10.0f%10.0f\n",stu[i].sum,stu[i].aver);
}
fclose(fp);
}
/*從文件中讀取學生的學號，姓名及成績等信息寫入到結構體數組stu中*/
void ReadfromFile(STU stu[],int *n,int *m)
{
FILE *fp;
int i,j;
if((fp=fopen("student.txt","r"))==NULL)
{
printf("Failure to open score.txt!\n");
exit(0);
}
fscanf(fp,"%d\t%d",n,m); //從文件中讀出學生人數和課程門數
for(i=0;i< *n;i++)
{
fscanf(fp,"%10ld",&stu[i].num);
fscanf(fp,"%10s",stu[i].name);
for(j=0;j< *m;j++)
{
fscanf(fp,"%10f",&stu[i].score[j]);
}
fscanf(fp,"%10f%10f",&stu[i].sum,&stu[i].aver); //不能用%10.0f
}
fclose(fp);
}