If you have a program that writes to an output file in C, how do you access/see that output file? For instance, I'm trying to write a program that writes the values from a .ppm image file to another .ppm image file, but I don't know how to access the output file after I've done so. I know that's a pretty general question, but I don't have a block of code I can share just yet.

CodePudding user response：

When creating a file with fopen by only specifying a file name, without specifying a path, then the file will be put in the current working directory of your program.

If you are using an integrated development environment (IDE) to launch your program, then you can probably see and set your program's initial working directory in your IDE. If you are running your program directly from a command-line shell, then the file will be placed in the current working directory of the shell.

On most operating systems, you can also determine your program's current working directory by calling a certain function provided by the operating system. For example, on POSIX-compliant operating systems, such as Linux, you can call getcwd. On Microsoft Windows, you can call _getcwd or GetCurrentDirectory. That way, you should easily be able to find out in which directory your file is being created.