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向C++大虾们请教
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发表于: 2011-1-3 20:44
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请大虾们帮我看看下面的程序，我在VC6.0下运行老出错：Debug Assertion Failed！
#include<conio.h>
#include<cstdio>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<iostream>
#include<vector>
#include<list>
#include<string>
#include<fstream>
#include<windows.h>
#include<mmsystem.h>
#include<assert.h>
#pragma comment(lib,"winmm.lib")
#define P1 6
static int m=P1;
static char p[P1+1]={""};
static const int MAXCHAR1=256;
class BMLSearch
{
int deltal[MAXCHAR1];
char *patt;
public:
BMLSearch(char*);
int BMLS(char *p,char *t,int m,int n);
};
char *NorP()//模式串生成模块
{
strcpy(p, "hello everyone");
return p;
}
BMLSearch::BMLSearch(char *p)//移动距离计算
{
assert(p);
patt=p;
int k=0;
for(k=0;k<MAXCHAR1;k++)
deltal[k]=m+1;
for(k=0;k<m-1;k++)
deltal[patt[k]]=m-k;
}
int BMLSearch::BMLS(char *p,char *t,int m,int n){//模式匹配
assert(t);
if(m>n){}
int k=m-1;
while(k<n){
int j=m-1;
int i=k;
while(j>=0&&t[i]-patt[j])
{j--;i--;}
if(j==-1)
return i+1;
k+=deltal[t[k+1]];
}
}
int main()//计时主模块
{
DWORD start=timeGetTime();//开始
FILE *fp;//读取文本
if((fp=fopen("test.txt","w"))==NULL)
{
printf("File open failed!\n");
exit(0);
}
char *t=NULL;
fgets(t,1024,fp);
fclose(fp);
static int n=strlen(t); //读取的字符串长度
char *p=NorP(); //模式串
int m=strlen(p);
BMLSearch BMLS(char *p,char *t,int m,int n);
DWORD end=timeGetTime();//结束计时
DWORD Total=end-start;//计算时间
FILE *fp1;//记录时间
char str[256];
if((fp1=fopen("BMLSTimeLogl.txt","w"))==NULL){
printf("File open failed!\n");
exit(0);
}
fputs(itoa(Total,str,10),fp1);
//fputs('\n',fp);
fclose(fp1);
return 0;
}
#include<conio.h>
#include<cstdio>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<iostream>
#include<vector>
#include<list>
#include<string>
#include<fstream>
#include<windows.h>
#include<mmsystem.h>
#include<assert.h>
#pragma comment(lib,"winmm.lib")
#define P1 6
static int m=P1;
static char p[P1+1]={""};
static const int MAXCHAR1=256;
class BMLSearch
{
int deltal[MAXCHAR1];
char *patt;
public:
BMLSearch(char*);
int BMLS(char *p,char *t,int m,int n);
};
char *NorP()//模式串生成模块
{
strcpy(p, "hello everyone");
return p;
}
BMLSearch::BMLSearch(char *p)//移动距离计算
{
assert(p);
patt=p;
int k=0;
for(k=0;k<MAXCHAR1;k++)
deltal[k]=m+1;
for(k=0;k<m-1;k++)
deltal[patt[k]]=m-k;
}
int BMLSearch::BMLS(char *p,char *t,int m,int n){//模式匹配
assert(t);
if(m>n){}
int k=m-1;
while(k<n){
int j=m-1;
int i=k;
while(j>=0&&t[i]-patt[j])
{j--;i--;}
if(j==-1)
return i+1;
k+=deltal[t[k+1]];
}
}
int main()//计时主模块
{
DWORD start=timeGetTime();//开始
FILE *fp;//读取文本
if((fp=fopen("test.txt","w"))==NULL)
{
printf("File open failed!\n");
exit(0);
}
char *t=NULL;
fgets(t,1024,fp);
fclose(fp);
static int n=strlen(t); //读取的字符串长度
char *p=NorP(); //模式串
int m=strlen(p);
BMLSearch BMLS(char *p,char *t,int m,int n);
DWORD end=timeGetTime();//结束计时
DWORD Total=end-start;//计算时间
FILE *fp1;//记录时间
char str[256];
if((fp1=fopen("BMLSTimeLogl.txt","w"))==NULL){
printf("File open failed!\n");
exit(0);
}
fputs(itoa(Total,str,10),fp1);
//fputs('\n',fp);
fclose(fp1);
return 0;
}
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您的代码中：
[CODE]char *t=NULL; fgets(t,1024,fp); fclose(fp);[/CODE] 未为t指针分配空间，也就是t未指向任何内存，被您初始化成为了0，引用此处内存必然会出错。 改正方法： char t[1024]; fgets(t,1024,fp); fclose(fp); 楼主，我没有币下载代码也下不了，希望您能给我，谢谢了！ 
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