#include <stdio.h> 
int main( ) 
{ 
	int num_spaces =30;
	printf("%*s1.Input\n",num_spaces," ");
	printf("%*s2.Output\n",num_spaces," ");
	printf("%*s3.Order\n",num_spaces," ");
	printf("%*s4.Quit\n",num_spaces," ");
	char a;
	again:a=getchar();
	switch(a)
	{
		case'i':printf("You are trying to Input info");break;
		case'o':printf("You are trying to Output info");break;
		case'm':printf("You are trying to Make things orderd");break;
		case'q':printf("You are about to Quit");break;
		case'\n':printf("\n");break;
		default:printf("Wrong input");
	}
	goto again;
}


#include <stdio.h> 
int main( ) 
{ struct Student
	{
		int xh;
		float gs;
		float dw;
		float yy;
		float zcj;	
	} student1,student2,student3;
	scanf("%d%f%f%f",&student1.xh,&student1.gs,&student1.dw,&student1.yy);
	scanf("%d%f%f%f",&student2.xh,&student2.gs,&student2.dw,&student2.yy);
	scanf("%d%f%f%f",&student3.xh,&student3.gs,&student3.dw,&student3.yy);
	student1.zcj=student1.gs+student1.dw+student1.yy;
	student2.zcj=student2.gs+student2.dw+student2.yy;
	student3.zcj=student3.gs+student3.dw+student3.yy;
	printf("学号  %d  高数成绩  %.1f  大学物理成绩  %.1f  英语成绩  %.1f  总成绩  %.1f\n",student1.xh,student1.gs,student1.dw,student1.yy,student1.zcj);
	printf("学号  %d  高数成绩  %.1f  大学物理成绩  %.1f  英语成绩  %.1f  总成绩  %.1f\n",student2.xh,student2.gs,student2.dw,student2.yy,student2.zcj);
	printf("学号  %d  高数成绩  %.1f  大学物理成绩  %.1f  英语成绩  %.1f  总成绩  %.1f\n",student3.xh,student3.gs,student3.dw,student3.yy,student3.zcj);
}

#include <stdio.h> 
int main( ) 
{ 
	int num_spaces =30;
	printf("%*s1.Input\n",num_spaces," ");
	printf("%*s2.Output\n",num_spaces," ");
	printf("%*s3.Order\n",num_spaces," ");
	printf("%*s4.Quit\n",num_spaces," ");
	char a;
	again:a=getchar();
	switch(a)
	{
		case'i':printf("Please input info of the three students:");
				struct Student
			{
			int xh;
			float gs;
			float dw;
			float yy;
			float zcj;
			float pjf;	
			} student1,student2,student3,studenttemp;
			scanf("%d%f%f%f",&student1.xh,&student1.gs,&student1.dw,&student1.yy);
			scanf("%d%f%f%f",&student2.xh,&student2.gs,&student2.dw,&student2.yy);
			scanf("%d%f%f%f",&student3.xh,&student3.gs,&student3.dw,&student3.yy);
			student1.zcj=student1.gs+student1.dw+student1.yy;
			student2.zcj=student2.gs+student2.dw+student2.yy;
			student3.zcj=student3.gs+student3.dw+student3.yy;
			student1.pjf=student1.zcj/3;
			student2.pjf=student2.zcj/3;
			student3.pjf=student3.zcj/3;
			if(student2.zcj>student3.zcj)
			{
                studenttemp = student2;
                student2 = student3;
                student3 = studenttemp;
            }
            if(student1.zcj>student3.zcj) 
			{
                studenttemp = student1;
                student1 = student3;
                student3 = studenttemp;
            }
            if(student1.zcj>student2.zcj)
			 {
                studenttemp = student1;
                student1 = student2;
                student2 = studenttemp;
		   	}
			printf("%d,%.1f,%.1f\n%d,%.1f,%.1f\n%d,%.1f,%.1f\n",student1.xh,student1.zcj,student1.pjf,student2.xh,student2.zcj,student2.pjf,student3.xh,student3.zcj,student3.pjf);
			break;
		case'o':printf("You are trying to Output info");break;
		case'm':printf("You are trying to Make things orderd");break;
		case'q':printf("You are about to Quit");break;
		case'\n':printf("\n");break;
		default:printf("Wrong input");
	}
	goto again;
}