This is not a question about SDL or about loading bitmap but more about directory structure. I'm not used to Xcode and I find your project path to be quite long, but usually the application will search the file in a relative path to the working directory. Under Windows, when you double click an .exe, the working directory is the same as the executable. Under visual studio when you run the application from the IDE it's by default the directory of the .sln file, but can be modified in the project settings. I'm guessing it's about the same for Xcode.

This is not a question about SDL or about loading bitmap but more about directory structure. I'm not used to Xcode and I find your project path to be quite long, but usually the application with search the file in a relative path to the working directory. Under Windows, when you double click an .exe, the working directory is the same as the executable. Under visual studio when you run the application from the IDE it's by default the directory of the .sln file, but can be modified in the project settings. I'm guessing it's about the same for Xcode.