C++爱好者 - 网友留言

各位高手们！我是C的初学者 ，有个问题 ，我编的C 运行在排序方面总是有问题 ，排出的名次 老是不是很对，希望各位能给我指点一下，帮我修改修改！谢谢啦！！非常紧急
#include
#include

#define N 6
struct student
{long xh;
 char xm[12];
 int cj[3];
 int mc;
 float pjcj;
};

void count();
void sort();
void put();

void main(){
    int i;
    char aa=' ';
    struct student std[N];
    struct student *k=std;

    while (aa!='e')
{
  printf("m:input\n");
  printf("c:count\n");
  printf("s:sort\n");
  printf("p:output\n");
  printf("e:exit\n");
  printf("please select: ");

  scanf("%c",&aa);
  printf("your select is %c\n",aa);

if(aa=='m')
  { printf("\n");
    for(i=0;i {printf("\n [%d]student id:",i+1);
scanf("%ld",&std[i].xh);
printf("\n student name:");
scanf("%s",&std[i].xm);
printf("\n math:");
scanf("%d",&std[i].cj[0]);
printf("\n english:");
scanf("%d",&std[i].cj[1]);
printf("\n computer:");
scanf("%d",&std[i].cj[2]);
printf("\n");
std[i].mc=i+1;

     }

  }
  else if(aa=='c')    count(std);
  else if(aa=='s')    sort(std);
  else if(aa=='p')    put(k);

}

 }

void count(struct student std[])
{ int i,j;
  for(i=0;i  {std[i].pjcj=0;
   for(j=0;j<3;j++)
       std[i].pjcj=std[i].pjcj+std[i].cj[j];
       std[i].pjcj=std[i].pjcj/3;
   }
   printf("\n count is ok! \n");
}
void sort(struct student std[])
{int i,j,t,k;
 float x[N],y[N];
 for(i=0;i   x[i]=std[i].pjcj;
 for (i=0;i  {k=i;
   for (j=i+1;jx[k])k=j;
   if(k!=i)   { t=x[i];x[i]=x[k];x[k]=t;}
   }
 for(i=0;i   for(j=0;j     if(std[i].pjcj==x[j])
std[i].mc=j+1;
   printf("\n sort is ok! \n");
 }

void put(struct student *p)
{ int i,j,m;
  FILE  *fp;
  if((fp=fopen("file.txt","w"))==NULL)
  {printf("Can't open thisfile !\n");
   exit(0);
  }
  fprintf(fp,"\n\t\t                 学生成绩表    \n");
  fprintf(fp,"\n\t-------------------------------------------------------------\n");
  fprintf(fp,"\n\t  学号     姓名    数学    英语   计算机  平均成绩   名次 \n");
  for(i=0;i  {fprintf(fp,"\n     %10ld",p->xh);
   fprintf(fp,"%10s",p->xm);
   for(j=0;j<3;j++)
   {fprintf(fp, "  %5d",p->cj[j]);
   }
   fprintf(fp,"  %8.2f",p->pjcj);
   fprintf(fp,"    %2d",p->mc);
    p++;
  }
  fprintf(fp,"\n\n\t------------------------------------------------------------\n");
  fclose(fp);
  printf("\n output is ok! \n");

}

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