#include ?<stdio.h>
#include ?<stdlib.h>
#include ?<string.h>
#define ? MAX_LEN ?10 ? /* 字符串最大長度 */
#define ? STU_NUM 30 /* 最多的學生人數 */
int ? Menu(void);
void ?ReadScore(long num[], char name[][MAX_LEN], float score[], int n);
void ?AverSumofScore(float score[], int n);
void ?SortbyScore(long num[], char name[][MAX_LEN], float score[], int n,
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(long num[], char name[][MAX_LEN], float score[], int n);
void ?SortbyName(long num[], char name[][MAX_LEN], float score[], int n);
void ?SearchbyNum(long num[], char name[][MAX_LEN], float score[], int n);
void ?SearchbyName(long num[], char name[][MAX_LEN], float score[], int n);
void ?StatisticAnalysis(float score[], int n);
void ?PrintScore(long num[], char name[][MAX_LEN], float score[], int n) ;
int main()
{
char ?ch;
int ? n = 0;
float score[STU_NUM];
long num[STU_NUM];
char name[STU_NUM][MAX_LEN];
printf("Input student number(n<30):\n");
scanf("%d", &n);
while (1)
{
ch = Menu(); /* 顯示菜單，並讀取用戶輸入 */
switch (ch)
{
case 1:
ReadScore(num, name, score, n);
break;
case 2:
AverSumofScore(score, n);
break;
case 3:
SortbyScore(num, name, score, n, Descending);
printf("Sort in descending order by score:\n");
PrintScore(num, name, score, n);
break;
case 4:
SortbyScore(num, name, score, n, Ascending);
printf("Sort in ascending order by score:\n");
PrintScore(num, name, score, n);
break;
case 5:
AsSortbyNum(num, name, score, n);
printf("Sort in ascending order by number:\n");
PrintScore(num, name, score, n);
break;
case 6:
SortbyName(num, name, score, n);
printf("Sort in dictionary order by name:\n");
PrintScore(num, name, score, n);
break;
case 7:
SearchbyNum(num, name, score, n);
break;
case 8:
SearchbyName(num, name, score, n);
break;
case 9:
StatisticAnalysis(score, n);
break;
case 10:
PrintScore(num, name, score, n);
break;
case 0:
printf("End of program!");
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 course\n");
printf("3.Sort in descending order by score\n");
printf("4.Sort in ascending order by score\n");
printf("5.Sort in ascending order by number\n");
printf("6.Sort in dictionary order by name\n");
printf("7.Search by number\n");
printf("8.Search by name\n");
printf("9.Statistic analysis\n");
printf("10.List record\n");
printf("0.Exit\n");
printf("Please Input your choice:\n");
scanf("%d", &itemSelected); /* 讀入用戶輸入 */
return itemSelected;
}
/* 函數功能：輸入n個學生的某門課成績 */
void ReadScore(long num[], char name[][MAX_LEN], float score[], int n)
{
int i;
printf("Input student's ID, name and score:\n");
for (i = 0; i < n; i++)
{
scanf("%ld%s%f", &num[i], name[i], &score[i]);
}
}
/* 函數功能：計算全班總分和平均分 */
void AverSumofScore(float score[], int n)
{
int i;
float ?sum = 0;
for (i = 0; i < n; i++)
{
sum = sum + score[i];
}
printf("sum=%.0f,aver=%.2f\n", sum, n > 0 ? sum / n : 0);
}
/* 函數功能：按選擇法將數組score的元素值排序 */
void SortbyScore(long num[], char name[][MAX_LEN], float score[], int n,
int (*compare)(float a, float b))
{
int i, j, k;
for (i = 0; i < n - 1; i++)
{
k = i;
for (j = i + 1; j < n; j++)
{
if ((*compare)(score[j], score[k])) k = j;
}
if (k != i)
{
SwapFloat(&score[k], &score[i]); /* 交換成績 */
SwapLong(&num[k], &num[i]); ? /* 交換學號 */
SwapChar(name[k], name[i]); ? /* 交換姓名 */
}
}
}
/* 使數據按升序排序 */
int Ascending(float a, float b)
{
return a < b; /* 這樣比較決定了按升序排序，如果a<b，則交換 */
}
/* 使數據按降序排序 */
int Descending(float a, float b)
{
return a > b; /* 這樣比較決定了按降序排序，如果a>b，則交換 */
}
/* 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;
}
/* 交換兩個長整型數據 */
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的元素值按從低到高排序 */
void AsSortbyNum(long num[], char name[][MAX_LEN], float score[], int n)
{
int i, j, k;
for (i = 0; i < n - 1; i++)
{
k = i;
for (j = i + 1; j < n; j++)
{
if (num[j] < num[k]) ?k = j;
}
if (k != i)
{
SwapFloat(&score[k], &score[i]); /* 交換成績 */
SwapLong(&num[k], &num[i]); ? /* 交換學號 */
SwapChar(name[k], name[i]); ? /* 交換姓名 */
}
}
}
/* 函數功能：交換法實現字符串按字典順序排序 */
void SortbyName(long num[], char name[][MAX_LEN], float score[], int n)
{
int i, j;
for (i = 0; i < n - 1; i++)
{
for (j = i + 1; j < n; j++)
{
if (strcmp(name[j], name[i]) < 0)
{
SwapFloat(&score[i], &score[j]); /* 交換成績 */
SwapLong(&num[i], &num[j]); ? /* 交換學號 */
SwapChar(name[i], name[j]); ? /* 交換姓名 */
}
}
}
}
/* 函數功能：按學號查找學生成績並顯示查找結果 */
void SearchbyNum(long num[], char name[][MAX_LEN], float score[], int n)
{
long number;
int ? i;
printf("Input the number you want to search:\n");
scanf("%ld", &number);
for (i = 0; i < n; i++)
{
if (num[i] == number)
{
printf("%ld\t%s\t%.0f\n", num[i], name[i], score[i]);
return;
}
}
printf("Not found!\n");
}
/* 函數功能：按姓名的字典順序排出成績表 */
void SearchbyName(long num[], char name[][MAX_LEN], float score[], int n)
{
char x[MAX_LEN];
int ?i;
printf("Input the name you want to search:\n");
scanf("%s", x);
for (i = 0; i < n; i++)
{
if (strcmp(name[i], x) == 0)
{
printf("%ld\t%s\t%.0f\n", num[i], name[i], score[i]);
return;
}
}
printf("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(float score[], int n)
{
int ?i, total, t[6] = {0, 0, 0, 0, 0, 0};
for (i = 0; i < n; i++)
{
if (score[i] >= 0 && score[i] < 60)t[0]++;
else if (score[i] < 70) t[1]++;
else if (score[i] < 80) t[2]++;
else if (score[i] < 90) t[3]++;
else if (score[i] < 100) ? t[4]++;
else if (score[i] == 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(long num[], char name[][MAX_LEN], float score[], int n)
{
int i;
for (i = 0; i < n; i++)
{
printf("%ld\t%s\t%.0f\n", num[i], name[i], score[i]);
}
}