Q: How can I open files with names like ``file1'', ``file2'', ``file3'', etc., where the numeric part is controlled by a variable? Basically I want ``file%d'', like printf.
A: You want printf's close cousin sprintf, which ``prints'' to a string:
char filename[FILENAME_MAX]; sprintf(filename, "file%d", i); fp = fopen(filename, "r");
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