aver下的值全是0

# include
# define N 10
# define M 5
float score[N][M];
float a_stu[N],a_cour[M];
int r,c;
int main()
{ int i,j;
  float h;
  void aver_stu(void);
  void aver_cour(void);
  void input_stu(void);
  float max();
  aver_stu();
  aver_cour();
  input_stu();
  printf("\n  NO.   cour1   cour2   cour3   cour4   cour5   aver\n");
  for(i=0;iprintf("\n NO %2d ",i+1);
  for(j=0;jprintf("%8.2f",score[i][j]);
  printf("%8.2f\n",a_stu[i]);
  }
  printf("\naverage:");
  for(j=0;jprintf("%8.2f",a_cour[j]);
    printf("\n");
    h=max();
    printf("max:%6.2f   NO. %2d   course %2d",h,r,c);
return 0;
}

void input_stu(void)
{int i,j;
  for(i=0;iprintf("stdudent%d:\n",i+1);
  for(j=0;jscanf("%f",&score[i][j]);
  }
}

void aver_stu(void)
{int i,j;
float s;
for(i=0;ifor(j=0,s=0;j5.0;
 }
}

void aver_cour(void)
{int i,j;
float s;
for(j=0;jfor(i=0,s=0;ifloat)N;
 }
}

float max()
{float high;
int i,j;
high=score[0][0];
for(i=0;ifor(j=0;jif(score[i][j]>high)
  {high=score[i][j];
  r=i+1;
  c=j+1;
  }
  return(high);
}
完全按照书上的代码，但就是aver下的值全是0，希望