File 我的代码可以';t重新分配内存(realloc())
我要求编写代码,检查文本文件(file1.txt)中最大的单词,并将该大小的所有单词写入另一个文本文件(file1a.txt),但它说我有一个realloc问题…如果我在file1.txt中只写一个大字,它可以工作,但当我写2个或更多单词时,它不会通过重新分配File 我的代码可以';t重新分配内存(realloc()),file,realloc,File,Realloc,我要求编写代码,检查文本文件(file1.txt)中最大的单词,并将该大小的所有单词写入另一个文本文件(file1a.txt),但它说我有一个realloc问题…如果我在file1.txt中只写一个大字,它可以工作,但当我写2个或更多单词时,它不会通过重新分配 #include <stdio.h> #include <string.h> #include <stdlib.h> #include <malloc.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
int check_big_word(FILE *read){
int count_letter = 0;
int max_letter_size = 0;
char letter;
letter = fgetc(read);
while(!feof(read) && letter != EOF){
count_letter = 0;
while(!(letter >= 'a' && letter <= 'z') || (letter >= 'A' && letter <= 'Z')){
if (feof(read)){
break;
}
letter = fgetc(read);
}
while((letter >= 'a' && letter <= 'z') || (letter >= 'A' && letter <= 'Z')){
if (feof(read)){
break;
}
count_letter++;
letter = fgetc(read);
}
if( count_letter > max_letter_size ){
max_letter_size = count_letter;
}
}
rewind(read);
return max_letter_size;
}
void print_all_big(FILE *read, FILE *write){
int big_size = check_big_word(read);
int count_letter = 0;
int count_words = 0,i,beggining_of_string = 0;
char letter;
char *string_of_biggers;
string_of_biggers = NULL;
letter = fgetc(read);
while(!feof(read)){
count_letter = 0;
while(!(letter >= 'a' && letter <= 'z') || (letter >= 'A' && letter <= 'Z')){
if (feof(read)){
break;
}
count_words++;
letter = fgetc(read);
}
while((letter >= 'a' && letter <= 'z') || (letter >= 'A' && letter <= 'Z')){
if (feof(read)){
break;
}
count_letter++;
letter = fgetc(read);
}
if(count_letter == big_size){
if(string_of_biggers == NULL){
string_of_biggers = (char*)malloc(sizeof(char)*(big_size+1));
}else{
//******* THE PROBLEM IS HERE *****
string_of_biggers = (char*)realloc(string_of_biggers, sizeof(char)*(big_size+1));
}
rewind(read);
fseek(read,count_words*sizeof(char),SEEK_SET);
for(i = 0; i<big_size;i++){
*string_of_biggers = fgetc(read);
beggining_of_string++;
string_of_biggers++;
}
*string_of_biggers = ' ';
beggining_of_string++;
string_of_biggers++;
}
count_words += count_letter;
}
string_of_biggers = string_of_biggers - beggining_of_string;
fputs(string_of_biggers,write);
fclose(read);
fclose(write);
}
void main(){
FILE *r, *w;
r = fopen("file1.txt", "rt");
w = fopen("file1a.txt", "wt");
print_all_big(r,w);
}
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int check_big_word(文件*读取){
整数计数字母=0;
int max_letter_size=0;
字符字母;
字母=fgetc(已读);
而(!feof(read)&&letter!=EOF){
计数字母=0;
而(!(字母>='a'&&letter='a'&&letter='a'&&letter='a'&&letter='a'&&letter最大字母大小){
最大字母大小=计数字母;
}
}
倒带(读);
返回最大字母大小;
}
无效打印(文件*读取,文件*写入){
int big\u size=检查大单词(读取);
整数计数字母=0;
int count_words=0,i,begging_of_string=0;
字符字母;
char*string_的_biggers;
字符串\u of_biggers=NULL;
字母=fgetc(已读);
而(!feof(read)){
计数字母=0;
调用realloc时(!(letter>='a'&&letter='a'&&letter='a'&&letter='a'&&letter必须传递上一次调用返回给malloc或realloc的确切指针。您没有这样做。您传递的是同一个变量,但已更改了变量中的指针
不要修改指针,而是使用索引。这样可以防止错误并使代码更具可读性。此外,无需检查NULL。如果将NULL指针传递给realloc,它将执行malloc