在Linux下使用C读取txt。 我应该把txt文件放在哪里？

Question

I am trying to read from a txt file using C under Linux. FILE*fp=fopen("test.txt","r"); I have the above code, but it's telling me "segmentation fault(core dumped)". Is this because I don't have my txt under the correct directory?

int main(int argc, char*args[])
{
//printf("%d\n", argc);
int i;
for(i=0;i<argc;i++)
{
printf("%s ", args[i]);
}
int numProcesses=10;
int memorySize=atoi(args[1]);
int pageSize=atoi(args[2]);
int alloAlg=atoi(args[3]);
int evicAlg=atoi(args[4]);
int globLoc=atoi(args[5]);
int peroid=atoi(args[6]);

FILE*fp;
fp=fopen("Desktop/plist.txt","r");
char buff[1000];
//fgets(buff,100,fp);
//printf("%s",buff);
}

Answer 1

When you open a file without a path, it is assumed that file rests in the current directory. As for your segmentation fault -- you should be testing the FILE pointer against NULL before trying to read/write from it anyway.

Answer 2

将文本文件放在创建可执行文件的文件夹中。

Answer 3

You are no getting segmentation fault because of FILE *fp = fopen("test.txt","r") command. (If this is what you are thinking)

If a file that you are trying to open by fopen() does not exist. fopen() will simply return NULL in that case.

You are getting segmentation fault, most probably, because you are trying to read something using the file pointer fp . For ex: you are doing something like char ch = fgetc(fp) .

To avoid this, you can always check the value returned by fopen() . NULL is return by fopen() if it cannot open the file.

So you could do something like this:

FILE *fp = fopen("text.txt","r");
if(fp == NULL)
{
    //Your code to handle this case where file was not opened by fopen
}
else
{
    //Do what you wanted to do with your file
}

So, answer to your question is both yes and no.

Yes: because the segmentation fault is because fp contains NULL because your txt file is not in your directory.

No: because the segmentation fault is actually because you are trying to access memory that you are not supposed to (), and not because the txt file is not present in directory, however with a note that, the root cause for it is that your file was not present in the directory.