我自己做了一下，觉得我的比较麻烦，看看大家有木有简单点解法！
Please input the name, sex, number, and scores of 3 courses of all 5 students, then sort in ascending order the 5 students according to the following instructions (1)~(5) using Bubble Sort or Selection Sort.
Problem: programing the function <a> void bubblesort(struct stu *, int n) or <b> void selectsort(struct stu *, int n);
(1) their average score of 3 courses;
(2) the maximum value of 3 courses;
(3) name;
(4) number---sn;
(5) the minimum value of 3 courses;
#include "stdio.h"
#include "string.h"
#define NUM 5 /*numbers of students*/
#define CRS 3 /*numbers of courses*/
struct stu
{
char name[10];
char sex;
char sn[20];
float score[CRS];
};
void bubblesort(struct stu *, int);
void selectsort(struct stu *, int);
main()
{
int i,j;
struct stu s[NUM];
struct stu *p = s;
strcpy(s[0].name,"zhangsan");
s[0].sex = 'M';
strcpy(s[0].sn,"jy1001005");
s[0].score[0]=95.0;
s[0].score[1]=78.0;
s[0].score[2]=83.0;
strcpy(s[1].name,"cuihua");
s[1].sex = 'F';
strcpy(s[1].sn,"sl1001003");
s[1].score[0]=65.0;
s[1].score[1]=98.0;
s[1].score[2]=73.0;
strcpy(s[2].name,"mazi");
s[2].sex = 'M';
strcpy(s[2].sn,"wy1002005");
s[2].score[0]=64.0;
s[2].score[1]=79.0;
s[2].score[2]=58.0;
strcpy(s[3].name,"ergou");
s[3].sex = 'M';
strcpy(s[3].sn,"jx1003002");
s[3].score[0]=67.0;
s[3].score[1]=89.0;
s[3].score[2]=72.0;
strcpy(s[4].name,"qiaofei");
s[4].sex = 'M';
strcpy(s[4].sn,"xj2004001");
s[4].score[0]=95.0;
s[4].score[1]=78.0;
s[4].score[2]=83.0;
printf("The information of students before sorting:\n");
for (i=0; i<NUM; i++)
{
printf("The name of student %d \n",i);
printf("%s\n",(p+i)->name);
printf("The sex of student %d \n",i);
printf("%c\n",(p+i)->sex);
printf("The number of student %d \n",i);
printf("%s\n",(p+i)->sn);
for (j=0; j<CRS; j++)
{
printf("The score of the course %d of the student %d \n", j, i);
printf("%f\n", s[i].score[j]);
}
}
bubblesort(s,NUM);
selectsort(p,NUM);
printf("The information of students after sorting:\n");
for (i=0; i<NUM; i++)
{
printf("The name of student %d \n",i);
printf("%s\n",(p+i)->name);
printf("The sex of student %d \n",i);
printf("%c\n",(p+i)->sex);
printf("The number of student %d \n",i);
printf("%s\n",(p+i)->sn);
for (j=0; j<CRS; j++)
{
printf("The score of the course %d of the student %d \n", j, i);
printf("%f\n", s[i].score[j]);
}
}
p = s;
}
/* To program*/
void bubblesort(struct stu * a, int n)
{
}
void selectsort(struct stu * a, int n)
{
}
（这是题目，我自己做的结果在下面，有木有同胞能帮我简化一下）
按（1）要求
双号
void bubblesort(struct stu * a, int n)
{
int i,j,last;
struct stu b;
i=0;
while(i<n-1)
{
last=n-1;
for(j=n-1;j>i;j--)
{ if(((a[j].score[0]+a[j].score[1]+a[j].score[2])/3)<((a[j-1].score[0]+a[j-1].score[1]+a[j-1].score[2])/3))
{
b=a[j-1];
a[j-1]=a[j];
a[j]=b;
last=j;
}
}
i=last;
}
}
单号
void selectsort(struct stu * a, int n)
{
int i,j,k;
struct stu b;
for(i=0;i<n-1;i++)
{
k=i;
for(j=i+1;j<n;j++)
{
if(((a[j].score[0]+a[j].score[1]+a[j].score[2])/3)<((a[k].score[0]+a[k].score[1]+a[k].score[2])/3))
k=j;
}
if(k!=i)
{
b=a[k];
a[k]=a[i];
a[i]=b;
}
}
}
按要求（2）
双号
void bubblesort(struct stu * a, int n)
{
int i,j,last;
float p,q;
struct stu b;
i=0;
while(i<n-1)
{
last=n-1;
for(j=n-1;j>i;j--)
{
p=a[j].score[0]>a[j].score[1]?(a[j].score[0]>a[j].score[2]?a[j].score[0]:a[j].score[2]):(a[j].score[1]>a[j].score[2]?a[j].score[1]:a[j].score[2]);
q=a[j-1].score[0]>a[j-1].score[1]?(a[j-1].score[0]>a[j-1].score[2]?a[j-1].score[0]:a[j-1].score[2]):(a[j-1].score[1]>a[j-1].score[2]?a[j-1].score[1]:a[j-1].score[2]);
if(p<q)
{
b=a[j-1];
a[j-1]=a[j];
a[j]=b;
last=j;
}
}
i=last;
}
}
单号
void selectsort(struct stu * a, int n)
{
int i,j,k;
float p,q;
struct stu b;
for(i=0;i<n-1;i++)
{
k=i;
for(j=i+1;j<n;j++)
{
p=a[j].score[0]>a[j].score[1]?(a[j].score[0]>a[j].score[2]?a[j].score[0]:a[j].score[2]):(a[j].score[1]>a[j].score[2]?a[j].score[1]:a[j].score[2]);
q=a[k].score[0]>a[k].score[1]?(a[k].score[0]>a[k].score[2]?a[k].score[0]:a[k].score[2]):(a[k].score[1]>a[k].score[2]?a[k].score[1]:a[k].score[2]);
if(p<q)
k=j;
}
if(k!=i)
{
b=a[k];
a[k]=a[i];
a[i]=b;
}
}
}
按要求（5）
双号
void bubblesort(struct stu * a, int n)
{
int i,j,last;
float p,q;
struct stu b;
i=0;
while(i<n-1)
{
last=n-1;
for(j=n-1;j>i;j--)
{
p=a[j].score[0]<a[j].score[1]?(a[j].score[0]<a[j].score[2]?a[j].score[0]:a[j].score[2]):(a[j].score[1]<a[j].score[2]?a[j].score[1]:a[j].score[2]);
q=a[j-1].score[0]<a[j-1].score[1]?(a[j-1].score[0]<a[j-1].score[2]?a[j-1].score[0]:a[j-1].score[2]):(a[j-1].score[1]<a[j-1].score[2]?a[j-1].score[1]:a[j-1].score[2]);
if(p<q)
{
b=a[j-1];
a[j-1]=a[j];
a[j]=b;
last=j;
}
}
i=last;
}
}
单号
void selectsort(struct stu * a, int n)
{
int i,j,k;
float p,q;
struct stu b;
for(i=0;i<n-1;i++)
{
k=i;
for(j=i+1;j<n;j++)
{
p=a[j].score[0]<a[j].score[1]?(a[j].score[0]<a[j].score[2]?a[j].score[0]:a[j].score[2]):(a[j].score[1]<a[j].score[2]?a[j].score[1]:a[j].score[2]);
q=a[k].score[0]<a[k].score[1]?(a[k].score[0]<a[k].score[2]?a[k].score[0]:a[k].score[2]):(a[k].score[1]<a[k].score[2]?a[k].score[1]:a[k].score[2]);
if(p<q)
k=j;
}
if(k!=i)
{
b=a[k];
a[k]=a[i];
a[i]=b;
}
}
}
按要求（3）
双号
void bubblesort(struct stu * a, int n)
{
int i,j,last;
struct stu b;
i=0;
while(i<n-1)
{
last=n-1;
for(j=n-1;j>i;j--)
{
if(strcmp(a[j].name,a[j-1].name)<0)
{
b=a[j-1];
a[j-1]=a[j];
a[j]=b;
last=j;
}
}
i=last;
}
}
单号
void selectsort(struct stu * a, int n)
{
int i,j,k;
struct stu b;
for(i=0;i<n-1;i++)
{
k=i;
for(j=i+1;j<n;j++)
{
if(strcmp(a[j].name,a[k].name)<0)
k=j;
}
if(k!=i)
{
b=a[k];
a[k]=a[i];
a[i]=b;
}
}
}
按要求（4）
双号
void bubblesort(struct stu * a, int n)
{
int i,j,last,x;
char p[10],q[10];
struct stu b;
i=0;
while(i<n-1)
{
last=n-1;
for(j=n-1;j>i;j--)
{
for(x=0;x<7;x++)
{
p[x]=a[j].sn[x+2];
}
for(x=0;x<7;x++)
{
q[x]=a[j-1].sn[x+2];
}
if(strcmp(p,q)<0)
{
b=a[j-1];
a[j-1]=a[j];
a[j]=b;
last=j;
}
}
i=last;
}
}
单号
void selectsort(struct stu * a, int n)
{
int i,j,k,x;
char p[10],q[10];
struct stu b;
for(i=0;i<n-1;i++)
{
k=i;
for(j=i+1;j<n;j++)
{
for(x=0;x<7;x++)
{
p[x]=a[j].sn[x+2];
}
for(x=0;x<7;x++)
{
q[x]=a[k].sn[x+2];
}
if(strcmp(p,q)<0)
k=j;
}
if(k!=i)
{
b=a[k];
a[k]=a[i];
a[i]=b;
}
}
}
