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#include 

#include "stdlib.h"

int i,j;

struct STUDENT

{

int xuehao;

float yuwen;

float shuxue;

float yingyu;

float sum;

float average;

}student[3];

void huhuan1(int a,int b)

{int c; c=a;a=b;b=c;}

void huhuan(float x,float y)

{float z; z=x;x=y;y=z;}

int main()

{

for(i=0;i<3;i++)

{

printf("input %d:\n ",i+1);

printf("xuehao:");

scanf("%d",student[i].xuehao);

printf("yuwen:");

scanf("%f",student[i].yuwen);

printf("shuxue:");

scanf("%f",student[i].shuxue);

printf("yingyu:");

scanf("%f",student[i].yingyu);

student[i].sum=student[i].yuwen+student[i].shuxue+student[i].yingyu;

student[i].average=student[i].sum/3;

printf("sum=%f\n",student[i].sum);

printf("average=%f\n",student[i].average);

}

for(i=0;i<3;i++)

for(j=i+1;j<3;j++)

if(student[j].sum>student[i].sum)

{ huhuan1( student[i].xuehao,student[j].xuehao);

huhuan(student[i].yuwen,student[j].yuwen);

huhuan(student[i].shuxue,student[j].shuxue);

huhuan(student[i].yingyu,student[j].yingyu);

huhuan(student[i].sum,student[j].sum);

huhuan(student[i].average,student[j].average);}

for(i=0;i<3;i++)

{printf("%d %f %f %f%f %f\n",student[i].xuehao,student[i].yuwen,

student[i].shuxue,student[i].yingyu,student[i].sum,student[i].average);}

getch();return 0;

}