我正在尝试从文件中逐行提取字符串,但它没有给我任何输出。该文件在令牌中包含一些单词。这是我的代码:
#include<stdio.h>
#include<string.h>
main(void)
{
FILE *open;
open = fopen("assembly.txt", "r");
FILE *write;
write = fopen("tokens.txt", "w");
FILE *a;
char ch;
char *str;
while ((ch = fgetc(open)) != EOF)
{
if (ch == 32 || ch == ',' || ch == '#')
fprintf(write, "\n");
else
fprintf(write, "%c", ch);
}
a = fopen("tokens.txt", "r");
while (!feof(a))
{
if (fgets(str, 126, a))
printf("%s", str);
}
}
我根本没有输出。程序成功执行,没有任何输出!
您的代码中有几个错误。第一:你没有关闭文件。第二:您使用尚未分配的 str 执行了 fgets,这将导致段错误。
通过修复,现在您的代码是:
#include<stdio.h>
#include<string.h>
int main(void)
{
FILE *open;
open = fopen("assembly.txt", "r");
FILE *write;
write = fopen("tokens.txt", "w");
FILE *a;
char ch;
char str[127];
while ((ch = fgetc(open)) != EOF)
{
if (ch == 32 || ch == ',' || ch == '#')
fprintf(write, "\n");
else
fprintf(write, "%c", ch);
}
fclose(write);
fclose(open);
a = fopen("tokens.txt", "r");
while (!feof(a))
{
if (fgets(str, 126, a))
printf("%s", str);
}
fclose(a);
return 0;
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系 [email protected] 删除。
我来说两句