13课前两题。

13/Exercise01.c

@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdbool.h>
+#define MALE false
+#define FEMALE true
+
+typedef struct {
+    int year;
+    int month;
+    int date;
+} DATE;
+
+typedef struct {
+    int ID;
+    char name[21];
+    bool sex;
+    DATE birthday;
+    double score;
+} STUDENT;
+
+double getAvg(STUDENT students[], int size) {
+    double sum = 0;
+    int i = 0;
+    for (i = 0; i < size; i++) {
+        sum += students[i].score;
+    }
+    sum /= size;
+    return sum;
+}
+
+void sortStu(STUDENT students[], int size) {
+    bool moved = false;
+    int i = 0;
+    STUDENT tmp;
+    do {
+        moved = false;
+        for (i = 0; i < size - 1; i++) {
+            if (students[i].score < students[i + 1].score) {
+                tmp = students[i];
+                students[i] = students[i+1];
+                students[i+1] = tmp;
+                moved = true;
+            }
+        }
+    } while (moved);
+    for (i = 0; i < size; i++) {
+        printf("%s: %lf\n", students[i].name, students[i].score);
+    }
+}
+
+int main() {
+    STUDENT students[10];
+    int i = 0;
+    // freopen("fakedata","r",stdin);
+    for (i = 0; i < 10; i++) {
+        printf("ID: ");
+        scanf("%d", &students[i].ID);
+        printf("Name(max 20 char): ");
+        scanf("%20s", students[i].name);
+        printf("Sex: (MALE-0/FEMLE-1)");
+        scanf("%d", &students[i].sex);
+        printf("Birthday (Year/Month/Date):");
+        scanf("%d/%d/%d", &students[i].birthday.year, &students[i].birthday.month, &students[i].birthday.date);
+        printf("Scores:\n");
+        scanf("%lf", &students[i].score);   
+    }
+    printf("The Average is: %lf\n", getAvg(students, 10));
+    printf("Sort result:\n");
+    sortStu(students, 10);
+    return 0;
+}

13/Exercise02.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <string.h>
+
+enum weekday {sun, mon, tue, wed, thu, fri, sat};
+
+int main() {
+    int input = 0;
+    char output[10];
+    scanf("%d", &input);
+    switch (input % 7)
+    {
+    case sun:
+        strcpy(output, "Sunday");
+        break;
+    case mon:
+        strcpy(output, "Monday");
+        break;
+    case tue:
+        strcpy(output, "Tuesday");
+        break;
+    case wed:
+        strcpy(output, "Wednesday");
+        break;
+    case thu:
+        strcpy(output, "Thursday");
+        break;
+    case fri:
+        strcpy(output, "Friday");
+        break;
+    case sat:
+        strcpy(output, "Saturday");
+        break;
+    default:
+        break;
+    }
+    printf("%s", output);
+    return 0;
+}

13/fakedata

@@ -0,0 +1,59 @@
+345
+aaa
+0
+2020/3/4
+3.5
+
+465
+bbb
+1
+2020/3/5
+4.5
+
+933
+ddd
+0
+2020/4/6
+5
+
+9688
+dadg
+0
+2020/12/6
+6.8
+
+33
+adfidadff
+0
+2020/4/6
+7.9
+
+34555
+aaa4wt
+0
+2020/3/4
+2.5
+
+463
+bbberr
+1
+2020/3/5
+6.5
+
+93364
+dddade
+0
+2020/4/6
+8
+
+9688243
+dadgjj
+0
+2020/12/6
+10
+
+33345
+adfidafd
+0
+2020/4/6
+9