newbie reading a file..how? plz help

hi i have to read a file(pj.dat)in 3 different ways.
1. file is in the same dir as the exe and i think it will be read by doing this:

FILE *fpData;
fpData=fopen("pj.dat","r");

2. i have to read the same file as it was in "C:" Drive i.e "C:\pj.dat"
for this i think we just supply the path which would look like:

FILE *fpData;
fpData=fopen("c:\pj.dat","r");

3. reading the same file from any drive letter(or directory structure) input by the user.
I am not sure but i think it should be something like:

char filePath[30]; //max chars of the filepath
FILE *fpData;
printf("Please enter the path:");
scanf("%s",filePath);

fpData=fopen(filePath,"r");


i am not sure if these will work. Can anyone make sure and point out my mistakes if i am wrong???

thanks
fahad

>>fpData=fopen("pj.dat","r");
dont forget to check out if you opened succefully the file, look:

Code:

---

if ((fpData = fopen("pj.dat","r")) == NULL) {
    //error, couldn't open the file
}

else {
  //now do your code.
}

---

>>scanf("%s",filePath);
for getting strings from a stream, use fgets, and don't forget to check if you have '\n' (fgets when can put, it put) in the string example:

Code:

---

char *p, filePath[SIZE];
...
fgets(filePath,sizeof(filePath),stdin);
p = strchr(filePath,'\n');
if(p) *p = 0;

---

For using the strchr() function add string.h

Now for reading, use function like, fgets(), fscanf(), fread() and so on... and for writing fprintf(), fwrite()...

Be aware that a backslash in a character constant or a string literal introduces an escape sequence. Common examples are '\n' for a newline and '\t' for a tab.

So for #2, your example is not correct.

Code:

---

FILE *fpData=fopen("c:\pj.dat","r");

---

To have a backslash in the string literal, it would be coded as follows.

Code:

---

FILE *fpData=fopen("c:\\pj.dat","r");

---

Note that this is for string literals as in your case #2. You wouldn't need to enter two backslashes for user input as in case #3. That is to say at the command line you could do something like the following.

Code:

---

Please enter the path: c:\pj.dat

---

thanks guys ;)