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I just started learning and every time I open "Myfirstcprogram it comes with a error
J.D. Sandifer18,813 Points
You might try reading the Xcode help about how to start a new, blank Objective C program. Then just create a main.c file and paste the code in from the example file. I'm not sure how to do it on a Mac, but in Windows you can open a main.c file in Notepad - the default text editor - and copy the code from it that way.