How to dynamically change filename while writing in a loop?

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I want to send the filename to function to write some data on file, in the first iteration write some content into a file named file0.txt, second iteration file1.txt and so on,
how can do that?

What I have tried:

void main(){
writetotxtfile(str,"file/*how can make this part dynamically change */ ");

}

Posted 22-Jun-18 4:44am

neveen neveen

Updated 22-Jun-18 5:12am

v2

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Richard MacCutchan · Accepted Answer · 2018-06-22T05:13:00

Solution 1

C++

char* base = "file";
char filename[256];
int index;
for (index = 0; index < uppervalue; index++)
{
    sprintf(filename, "%s%d.txt", base, index);
    writetotxtfile(filename, other parameters);
}

Posted 22-Jun-18 5:13am

Richard MacCutchan

Comments

neveen neveen 22-Jun-18 12:43pm

thank, another question please, how can use specific path in fp=fopen(filename,"w+"); I'm use debian.

neveen neveen 22-Jun-18 14:03pm

I'm using something like this but the file is not created fp=fopen("home/pcdebian/folder/filename","w+");

Richard MacCutchan 22-Jun-18 15:38pm

You need to add the path into the filename string at the sprintf command. You cannot put a variable name into a string and expect the system to understand it.

neveen neveen 22-Jun-18 16:21pm

I do this, thanks