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6.c

@@ -0,0 +1,100 @@
+#include <stdio.h>
+#include <string.h>
+
+struct Data
+{
+	int ID;
+	int Class;
+	float score1;
+	float score2;
+	float score3;
+	char name[101];
+} stu[1001];
+int stl = 0;
+struct Data* stuflag = 0;
+
+float total(struct Data* a) {
+	return a->score1 + a->score2 + a->score3;
+}
+
+void swap(struct Data* a, struct Data* b) {
+	struct Data t = *a;
+	*a = *b;
+	*b = t;
+
+	if (a == stuflag) stuflag = b;
+else 
+	if (b == stuflag) stuflag = a;
+}
+
+void Sort() {
+	int i, j;
+	for(i = 0; i < stl-1; i++) {
+		for (j = 0; j < stl-i-1; j++) {
+			if (stu[j].Class < stu[j+1].Class) continue;
+			if (stu[j].Class > stu[j+1].Class || 
+			total(&stu[j]) < total(&stu[j+1])) swap(&stu[j], &stu[j+1]);
+		}
+	}
+}
+
+void input1() {
+	scanf("%d", &stu[stl].ID);
+	scanf("%f", &stu[stl].score1);
+	scanf("%f", &stu[stl].score2);
+	scanf("%f", &stu[stl].score3);
+	stl++;
+}
+
+
+void Input() {
+	printf("Please input info of three students:\n");
+	input1();input1();input1();
+	if (total(&stu[stl-3]) < total(&stu[stl-2])) swap(&stu[stl-3], &stu[stl-2]);
+	if (total(&stu[stl-2]) < total(&stu[stl-1])) swap(&stu[stl-2], &stu[stl-1]);
+	if (total(&stu[stl-3]) < total(&stu[stl-2])) swap(&stu[stl-3], &stu[stl-2]);
+	printf("%d,%.1f,%.1f\n", stu[stl-3].ID, total(&stu[stl-3]), total(&stu[stl-3])/3.0f);
+	printf("%d,%.1f,%.1f\n", stu[stl-2].ID, total(&stu[stl-2]), total(&stu[stl-2])/3.0f);
+	printf("%d,%.1f,%.1f\n", stu[stl-1].ID, total(&stu[stl-1]), total(&stu[stl-1])/3.0f);
+}
+
+
+
+void Modify() {
+	
+	struct Data t;
+	scanf("%d", &t.ID);
+	scanf("%d", &t.Class);	
+	scanf("%s", t.name);	
+	scanf("%f", &t.score1);
+	scanf("%f", &t.score2);
+	scanf("%f", &t.score3);
+
+	int i;
+	
+	for(i=0; i<stl; i++) {
+		if (t.ID == stu[i].ID) {
+			stu[i] = t;
+			stuflag = stu + i;
+			break;
+		}
+	}
+	Sort();
+	for(i=0; i<stl; i++) {
+		if (i>0 && stu[i].Class == stu[i-1].Class) printf("   ");
+		else printf("%2d ", stu[i].Class);
+		printf("%d %s %2.1f %2.1f %2.1f", stu[i].ID, stu[i].name, 
+					stu[i].score1, stu[i].score2, stu[i].score3);
+		if (stuflag == stu + i) printf(" modified");
+		printf("\n");
+	}
+
+}
+
+int main() {
+	stu[0] = (struct Data){10001, 11, 99.5, 88.5, 89.5, "Zhang"};
+	stu[1] = (struct Data){10002, 12, 77.9, 56.5, 87.5, "Yang"};
+	stu[2] = (struct Data){10003, 11, 92.5, 89.0, 60.5, "Liang"};
+	stl = 3;
+	Modify();
+}