Writing to file with variable filename

Hi guys. I'm using fopen() in order to open a file to write some data. My problem is that i want to have a variable filename and not one with a constant name. I know that fopen() takes a const char as a filename parameter, but is there any way to do this?
Thanks

Please be a little clearer.
Do you mean you want to change the contents of the char array the holds the name and fopen to just swich files on the fly? That ain't happening. You need to call fopen for each file you want to open and read or write.
And since your using C++ you should use fstream object to read and write files.

Sorry... Lets say it in code way.

Code:

---

void writeFile(int i);

iny main(){
float data;

for(int i=0;i<100;i++){
writeFile(i);
}

return 0;

}

writeFile(int i){
//each time this function called a new file created in the disk
//filename : use the parameter i to construct the file name
//for example filei.txt so to have file1.txt, file2.txt ... file100.txt


}

---

I hope this to be more clear....
Thanks for your time.

Then you could use the string class like this.

Code:

---

string str;

str = "file" + i + ".txt;

---

However if you don't want to use the string class or you're not allowed to then you can do this.

Code:

---

char str[16];

sprintf("file%d.txt", i);

---

I hope that clears it up for you.

Cool!!!
Thanks a lot...