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第三题.c

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+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+void input();
+void order();
+void output();
+void menu();
+int sum=0;
+struct stu
+{
+	int Id;
+	float score1;
+	float score2;
+	float score3;
+	float score;
+	float arvscore;
+}stu[1000];
+int main()
+{
+	while(1)
+	{
+		menu();
+	}
+}
+void menu()
+{
+	char t;
+	printf("                              1.Input\n");
+	printf("                              2.output\n");
+	printf("                              3.order\n");
+	printf("                              4.quit\n");
+	t=getchar();
+	if(t=='i')
+	{
+		printf("Please input info of the three students:\n");
+		for(int i=0;i<3;i++)
+		{
+			input();
+		}
+		order();
+		output();
+		exit(0);
+	}
+	else if(t=='o')
+	{
+		printf("You are trying to Output info\n");
+	}
+	else if(t=='m')
+	{
+		printf("You are trying to Make things ordered\n");
+	}
+	else if(t=='q')
+	{
+		printf("You are about to Quit\n");
+	}
+	else
+	{
+		if(t!='\n')
+		{
+			printf("Wrong input\n");
+		}
+	}
+}
+void input()
+{
+	sum=sum+1;
+	scanf("%d",&stu[sum].Id);
+	scanf("%f",&stu[sum].score1);
+	scanf("%f",&stu[sum].score2);
+	scanf("%f",&stu[sum].score3);
+	stu[sum].score=stu[sum].score3+stu[sum].score2+stu[sum].score1;
+	stu[sum].arvscore=stu[sum].score/3;
+}
+void order()
+{
+	for(int i=1;i<=sum;i++)
+	{
+		for(int j=i;j<=sum;j++)
+		{
+			if(stu[i].score>stu[j].score)
+			{
+				stu[sum+1]=stu[i];
+				stu[i]=stu[j];
+				stu[j]=stu[sum+1];
+			}
+		}
+	}
+}
+void output()
+{
+	for(int i=1;i<=sum;i++)
+	{
+		printf("%d %.1f %.1f\n",stu[i].Id,stu[i].score,stu[i].arvscore);
+	}
+}
+