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7.c

@@ -0,0 +1,132 @@
+#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 Print1(int i)
+{
+	printf("%d %d %s %.1f %.1f %.1f\n", stu[i].ID, stu[i].Class, stu[i].name,
+				 stu[i].score1, stu[i].score2, stu[i].score3);
+}
+
+void Search() {
+	int t; char com[101]; 
+	int i;
+	scanf("%d %s", &t, com);
+	switch(t) {
+		case 1: {
+			int from, to;
+			sscanf(com, "%d-%d", &from, &to);
+			for (i=0; i<stl; i++) {
+				if (stu[i].Class >= from && stu[i].Class <= to)
+					Print1(i);
+			}
+		}break;
+		case 2: {
+			int from, to;
+			sscanf(com, "%d-%d", &from, &to);
+			for (i=0; i<stl; i++) {
+				if (stu[i].ID >= from && stu[i].ID <= to)
+					Print1(i);
+			}
+		}break;
+		case 3: {
+			for (i=0; i<stl; i++) {
+				int flag = 1, j;
+				for (j=0; com[j] != '*'; j++) {
+					if (stu[i].name[j] != com[j]) {
+						flag = 0; break;
+					}
+				}
+				if(flag)
+					Print1(i);
+			}
+		}break;
+		case 4: {
+			float gate;
+			sscanf(com, "%f", &gate);
+			for (i=0; i<stl; i++) {
+				if (total(stu + i) >= gate - 0.01f)
+					Print1(i);
+			}
+		}break;
+		case 5: {
+			int Class, from, to;
+			sscanf(com, "%d.%d-%d", &Class, &from, &to);
+			for (i=0; i<stl; i++) {
+				if (stu[i].ID >= from && stu[i].ID <= to)
+				if (stu[i].Class == Class)
+					Print1(i);
+			}
+		}
+	}
+}
+
+
+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"};
+	stu[3] = (struct Data){10004, 11, 89.6, 56.9, 90.5, "Cai"};
+	stu[4] = (struct Data){10005, 14, 55.6, 67.9, 98.9, "Fu"};
+	stu[5] = (struct Data){10006, 12, 22.1, 45.9, 99.2, "Mao"};
+	stu[6] = (struct Data){10007, 13, 35.6, 67.9, 88.0, "Zhan"};
+	stl = 7;
+	Sort();
+	Search();
+}