一个C++程序的运行问题

[dotamaintain]

#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <stdlib.h>
struct stu
{ int num;
char name;
float score;
struct stu *next;
};

struct stu *Delete(struct stu *tou, int n)
{
struct stu *p1, *p2;
p1=tou;
if(p1->num==n)
tou=p1->next;
else
{
do
{
p2=p1;
p1=p1->next;
}
while(p1!=NULL && p1->num!=n);
if(p1->num==n)
p2->next=p1->next;
else printf("Not be found!\n");
}
free(p1);
return(tou);
}

struct stu *Insert(struct stu *tou, struct stu *s)
{
struct stu *p1, *p2;
p2=p1=tou;
if (tou==NULL)
{tou=s;s->next=NULL;}
else if(s->num<p1->num)
{
s->next=tou;
tou=s;
}
else if(s->num>p1->num)
{
while(s->num>p1->num&&p1->next!=NULL)
{
p2=p1; p1=p1->next;
}
if(s->num<p1->num)
{
p2->next=s; s->next=p1;
}
else if(s->num>p1->num)
{
p1->next=s;
s->next=NULL;
}
}
return(tou);
}

struct stu *Insert2(struct stu *tou, struct stu *s)
{
struct stu *p1, *p2;
p2=p1=tou;
if (tou==NULL)
{tou=s;}
else if(s->score<=p1->score)
{
s->next=tou;
tou=s;
}
else if(s->score>p1->score)
{
while(s->score>p1->score&&p1->next!=NULL)
{
p2=p1; p1=p1->next;
}
if(s->score<=p1->score)
{
p2->next=s; s->next=p1;
}
else if(s->score>p1->score)
{
p1->next=s;
s->next=NULL;
}
}
return(tou);
}

void sequence(struct stu *tou)
{
struct stu *p1, *p2;
p1=tou;
while(p1!=NULL)
{
p2=Insert2(p2,p1);
p1=p1->next;
}
while(p2!=NULL)
{
printf("%ld %10s %d",p2->num,p2->name,p2->score);
p2=p2->next;
}
}

void filewrite(struct stu *tou,FILE *fp)
{
struct stu *p1;
p1=tou;
while(p1!=NULL)
{
fprintf(fp,"%d %s %f",p1->num,p1->name,p1->score);
printf("Number Name score");
printf("%6ld %s %f",p1->num,p1->name,p1->score);
p1=p1->next;
}
}

void main()
{
FILE *fp;
int len;
char i;
int flag=1;
struct stu *tou;
tou=NULL;
len=sizeof(struct stu);
if((fp=fopen("E:\\123.txt","wt+"))==NULL)
{
printf("\n error on open E:\\123.txt file! \n");
exit(1);
}
fp=fopen("E:\\123.txt", "wt+");
printf("1 for read. 2 for insert. 3 for delete. 4 for sequence. 5 for write.\nPlease Choose One:");
while(flag==1)
{
scanf("%c",&i);
switch(i)
{
case '1':
struct stu *temp,*t1;
while(!feof(fp))
{
temp=(struct stu *) malloc(len);
fscanf(fp,"%ld %s %f",&temp->num,temp->name,&temp->score);
tou=Insert(tou,temp);
}
t1=tou;
do
{
printf("Number Name score");
printf("%6ld %s %f\n",t1->num,t1->name,t1->score);
t1=t1->next;
}
while(t1!=NULL);
break;
case '2':
struct stu *s,*t2;
s=(struct stu *) malloc(len);
printf("the num");
scanf("%ld",&s->num);
printf("the name");
scanf("%s",s->name);
printf("the score");
scanf("%f",&s->score);
tou=Insert(tou,s);
t2=tou;
while(t2!=NULL)
{
printf("Number Name score");
printf("%6ld %s %f",t2->num,t2->name,t2->score);
t2=t2->next;
}
break;
case '3':
struct stu *t3;
long k;
printf("tne num to delete");
scanf("%d",&k);
tou=Delete(tou,k);
t3=tou;
while(t3!=NULL)
{
printf("Number Name score");
printf("%6ld %s %f",t3->num,t3->name,t3->score);
t3=t3->next;
}
break;
case '4':
sequence(tou);
break;
case '5':
filewrite(tou,fp);
break;
int t;
printf("Quit or not \n 1 for Yes. 2 for No");
scanf("%d",&t);
if(t==1)
flag=0;
else if(t==2)
flag=1;
else
printf("error");
flag=1;
}
}
fclose(fp);
}

此程序完成的是对指针的插入删除排序等问题 但是运行程序读取的时候就发生问题 具体是什么情况？

[logiciel]

帮你改一段：

case '1': 
    struct stu *t1; 
    while(!feof(fp)) 
    { 
        struct stu temp;
        if (fscanf(fp,"%ld %s %f",&temp.num,temp.name,&temp.score)==3)
        {
          struct stu *temp2=(struct stu *) malloc(len); 
          *temp2 = temp;
          tou=Insert(tou,temp2); 
        }
    } 
    t1=tou; 
    while(t1!=NULL)
    { 
      printf("Number          Name          score"); 
                printf("%6ld    %s    %f\n",t1->num,t1->name,t1->score); 
      t1=t1->next; 
    }
    break; 

[IT_lau]

xx

[ysuliu]

好长啊，帮顶。。
麻烦下次说出问题在哪，免得从头看。。。

[logiciel]

再帮你改一些:

结构类型stu中的name应是一个数组。
printf一行要有回车。
处理“Quit or not”的地方有问题。

#include <stdio.h> 
#include <malloc.h> 
#include <string.h> 
#include <stdlib.h>

#define MAX_NAME 30 //新加
struct stu 
{ 
  int num; 
  char name[MAX_NAME];  //新加
  float score; 
  struct stu *next;    
}; 

struct stu *Delete(struct stu *tou, int n) 
{ 
  struct stu *p1, *p2; 
  p1=tou; 
  if(p1->num==n) 
    tou=p1->next; 
  else 
  {  
    do 
    { 
      p2=p1;  
      p1=p1->next; 
    } 
    while(p1!=NULL && p1->num!=n); 
    if(p1->num==n) 
      p2->next=p1->next;  
    else printf("Not be found!\n");          
  } 
  free(p1);                
  return(tou); 
} 

struct stu *Insert(struct stu *tou, struct stu *s) 
{ 
  struct stu *p1, *p2;        
  p2=p1=tou; 
  if (tou==NULL) 
  {tou=s;s->next=NULL;} 
  else if(s->num <p1->num) 
  { 
  s->next=tou; 
  tou=s; 
  } 
  else if(s->num>p1->num) 
  { 
  while(s->num>p1->num&&p1->next!=NULL) 
  { 
  p2=p1; p1=p1->next; 
  } 
  if(s->num <p1->num) 
  { 
  p2->next=s; s->next=p1; 
  } 
  else if(s->num>p1->num) 
  { 
  p1->next=s; 
  s->next=NULL; 
  } 
  } 
  return(tou); 
} 

struct stu *Insert2(struct stu *tou, struct stu *s) 
{ 
  struct stu *p1, *p2;        
  p2=p1=tou; 
  if (tou==NULL) 
  {tou=s;} 
  else if(s->score <=p1->score) 
  { 
  s->next=tou; 
  tou=s; 
  } 
  else if(s->score>p1->score) 
  { 
  while(s->score>p1->score&&p1->next!=NULL) 
  { 
  p2=p1; p1=p1->next; 
  } 
  if(s->score <=p1->score) 
  { 
  p2->next=s; s->next=p1; 
  } 
  else if(s->score>p1->score) 
  { 
  p1->next=s; 
  s->next=NULL; 
  } 
  } 
  return(tou); 
} 

void sequence(struct stu *tou) 
{ 
  struct stu *p1, *p2; 
  p1=tou; 
  while(p1!=NULL) 
  { 
    p2=Insert2(p2,p1); 
    p1=p1->next; 
  }   
  while(p2!=NULL) 
  { 
  printf("%ld %10s %d\n",p2->num,p2->name,p2->score); //printf("%ld %10s %d",p2->num,p2->name,p2->score); 
  p2=p2->next; 
  } 
}  

void filewrite(struct stu *tou,FILE *fp) 
{ 
  struct stu *p1; 
  p1=tou; 
  while(p1!=NULL) 
  { 
    fprintf(fp,"%d %s %f\n",p1->num,p1->name,p1->score); //fprintf(fp,"%d %s %f",p1->num,p1->name,p1->score);
    printf("Number          Name          score\n"); //printf("Number          Name          score");
    printf("%6ld    %s    %f\n",p1->num,p1->name,p1->score); //printf("%6ld    %s    %f",p1->num,p1->name,p1->score);
    p1=p1->next; 
  } 
} 

void main() 
{ 
  FILE *fp; 
  int len; 
  char i; 
  int flag=1; 
  struct stu *tou=NULL; 
  len=sizeof(struct stu); 
  if((fp=fopen("E:\\123.txt","wt+"))==NULL)
  { 
    printf("\n error on open E:\\123.txt file! \n"); 
    exit(1); 
  } 
  fp=fopen("E:\\123.txt", "wt+"); 
  while(flag==1) 
  { 
    //移到这里,每次有提示
    printf("1 for read.  2 for insert.  3 for delete.  4 for sequence.  5 for write.\nPlease Choose One:"); 
    scanf("%c",&i); 
    switch(i) 
    { 
      case '1': 
        struct stu temp, *t1;
        while (fscanf(fp,"%ld %s %f",&temp.num,temp.name,&temp.score)==3)
        {
          struct stu *temp2=(struct stu *) malloc(len); 
          *temp2 = temp;
          tou=Insert(tou,temp2); 
        }
        t1=tou; 
        while(t1!=NULL)
        { 
          printf("Number          Name          score\n"); //printf("Number          Name          score");
          printf("%6ld    %s    %f\n",t1->num,t1->name,t1->score); //printf("%6ld    %s    %f\n",t1->num,t1->name,t1->score); 
          t1=t1->next; 
        }
        break;
      case '2': 
        struct stu *s,*t2; 
         s=(struct stu *) malloc(len); 
         printf("the num"); 
         scanf("%ld",&s->num); 
         printf("the name"); 
         scanf("%s",s->name); 
         printf("the score"); 
         scanf("%f",&s->score); 
         tou=Insert(tou,s); 
         t2=tou; 
         while(t2!=NULL) 
         { 
           printf("Number          Name          score\n"); //printf("Number          Name          score");
           printf("%6ld    %s    %f\n",t2->num,t2->name,t2->score); //printf("%6ld    %s    %f",t2->num,t2->name,t2->score); 
           t2=t2->next; 
         } 
         break; 
       case '3': 
         struct stu *t3; 
         long k; 
         printf("tne num to delete"); 
         scanf("%d",&k); 
         tou=Delete(tou,k); 
         t3=tou; 
         while(t3!=NULL) 
         { 
           printf("Number          Name          score\n");//printf("Number          Name          score"); 
           printf("%6ld    %s    %f\n",t3->num,t3->name,t3->score); //printf("%6ld    %s    %f",t3->num,t3->name,t3->score);
           t3=t3->next; 
         } 
         break; 
       case '4': 
         sequence(tou); 
         break; 
       case '5': 
         filewrite(tou,fp); 
         break; 
    } //新加
    int t; 
    printf("Quit or not \n 1 for Yes. 2 for No"); 
    scanf("%d",&t); 
    if(t==1) 
      flag=0; 
    else if(t==2) 
      flag=1; 
    else
    {//新加
      printf("error"); 
      flag=1;
    }//新加
    fflush(stdin);//新加
  } 
  fclose(fp);
} 

[elegant87]

//把你的main函数改了改
void main() 
{ 
	FILE *fp; 
    int len,t; 
    int i; 
    int flag=1; 
    struct stu *tou=NULL; 
    len=sizeof(struct stu); 
    if((fp=fopen("E:\\123.txt","wt+"))==NULL) 
	{ 
		printf("\n error on open E:\\123.txt file! \n"); 
        exit(1); 
	} 
    fp=fopen("E:\\123.txt", "wt+"); 
   
    while(flag==1) 
	{  
		printf("1 for read.  2 for insert.  3 for delete.  4 for sequence.  5 for write.\nPlease Choose One:"); 
		scanf("%d",&i); 
        switch(i) 
		{ 
		case 1: 
			{
				struct stu *temp,*t1; 
                while(!feof(fp)) 
				{ 
					temp=(struct stu *) malloc(len); 
                    fscanf(fp,"%ld %s %f",&temp->num,temp->name,&temp->score); 
                    tou=Insert(tou,temp); 
				} 
		        t1=tou; 
                do 
				{ 
		        	printf("Number          Name          score"); 
                    printf("%6ld    %s    %f\n",t1->num,t1->name,t1->score); 
                    t1=t1->next; 
				} while(t1!=NULL); 
			}
            break; 
       case 2: 
		   {
			   struct stu *s,*t2; 
               s=(struct stu *) malloc(len); 
               printf("the num"); 
               scanf("%ld",&s->num); 
               printf("the name"); 
               scanf("%s",s->name); 
               printf("the score"); 
               scanf("%f",&s->score); 
               tou=Insert(tou,s); 
               t2=tou; 
               while(t2!=NULL) 
			   { 
                   printf("Number          Name          score"); 
                   printf("%6ld    %s    %f",t2->num,t2->name,t2->score); 
                   t2=t2->next; 
			   } 
		   }
           break; 
      case 3: 
		  {
			  struct stu *t3; 
              long k; 
              printf("tne num to delete"); 
              scanf("%d",&k); 
              tou=Delete(tou,k); 
              t3=tou; 
              while(t3!=NULL) 
			  { 
				  printf("Number          Name          score"); 
                  printf("%d    %s    %f",t3->num,t3->name,t3->score); 
                 t3=t3->next; 
			  } 
		  }
          break; 
      case 4: 
		  sequence(tou); 
          break; 
	  case 5: 
           filewrite(tou,fp); 
           break; 
		}
        printf("\nQuit or not \n 1 for Yes. 2 for No");
        scanf("%d",&t); 
        if(t==1) 
        flag=0; 
        else
	       if(t==2) 
             flag=1; 
          else 
		  {
	         printf("error\n"); 
             flag=1; 
		  }
	} 
    fclose(fp); 
} 

[xczjm]

好长啊，LZ

[macrojj]

你的指针非法访问了

[cocat]

好多啊~看不下去~楼主还是把核心代码贴出来吧

[ypb362148418]

好长啊，下次说出来哪错了，大家也好改啊，这样直接上一堆代码，真的好长