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3.c

@@ -0,0 +1,98 @@
+#include <stdio.h>
+int main()
+{
+	void manu();
+	void log();
+	manu();
+	log();
+	return 0;
+}
+
+void manu()
+{
+	printf("                              1.Input\n");
+	printf("                              2.Output\n");
+	printf("                              3.Order\n");
+	printf("                              4.Quit\n");
+	char t=getchar();
+	if(t=='i')
+	{
+		printf("Please input info of the three students:\n");
+	}
+	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
+	{
+		printf("Wrong input\n");
+	}
+}
+
+void log()
+{
+	float sum(float a[][5]);
+	void sort(float a[][5]);
+	float student[3][5];
+	int i,j;
+	for(i=0;i<3;i++)
+	{
+		for(j=0;j<4;j++)
+		{
+			scanf("%f",&student[i][j]);
+		}
+	}
+	sum(student);
+	sort(student);
+	for(i=0;i<3;i++)
+	{
+		printf("%g,%4.1f,%4.1f\n",student[i][0],student[i][4],student[i][4]/3);
+	}
+}
+
+float sum(float a[][5])
+{
+	int i;
+	for(i=0;i<3;i++)
+	{
+		a[i][4]=a[i][1]+a[i][2]+a[i][3];
+	}
+}
+
+void sort(float a[][5])
+{
+	void swap(float a[][5],int x,int y);
+	int i,j,k;
+	for(i=0;i<3;i++)
+	{
+		k=i;
+		for(j=i;j<3;j++)
+		{
+			if(a[i][4]>a[j][4])
+			{
+				k=j;
+			}
+		}
+		swap(a,i,k);
+	}
+}
+
+void swap(float a[][5],int x,int y)
+{
+	int i;
+	float temp;
+	for(i=0;i<5;i++)
+	{
+		temp=a[x][i];
+		a[x][i]=a[y][i];
+		a[y][i]=temp;
+	}
+}