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a3.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+struct stu {
+    int num;
+    float grade1;
+    float grade2;
+    float grade3;
+    float grade;
+    float ag;
+}s[10],ss;
+
+int main() 
+{
+	printf("                              1.Input\n");
+	printf("                              2.Output\n");
+	printf("                              3.Order\n");
+	printf("                              4.Quit\n");
+	char a;
+	scanf("%c",&a);
+	if(a=='i')
+	{
+	
+
+	    printf("Please input info of the three students:\n");
+	    for(int i=0;i<3;i++)
+	    {
+		scanf("%d%f%f%f",&s[i].num,&s[i].grade1,&s[i].grade2,&s[i].grade3);
+	    }
+	    for(int i=0;i<3;i++)
+	    {
+		   s[i].grade=s[i].grade1+s[i].grade2+s[i].grade3;
+		   s[i].ag=s[i].grade/3;
+	    }
+	    for(int i=0;i<2;i++)
+	    {
+	    	ss=s[i];
+	    	for(int j=i+1;j<3;j++)
+	    	{
+	    		if(s[i].grade>s[j].grade)
+	    		{
+	    			ss=s[i];
+	    			s[i]=s[j];
+	    			s[j]=ss;
+				}
+	    		
+			}
+		}
+	    for(int i=0;i<3;i++)
+	{
+		printf("%d,%.1f,%.1f\n",s[i].num,s[i].grade,s[i].ag);
+	}
+	}
+	else if(a=='o')
+	printf("You are trying to Output info");
+	else if(a=='m')
+	printf("You are trying to Make things ordered");
+	else if(a=='q')
+	printf("You are about to Quit");
+	else
+	printf("Wrong input");
+	
+	return 0;
+}