having trouble to print helo world....

I am using a mac, and I wrote a simple code using Xcode

Code:

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#include <stdio.h>
int main () {
  printf ("hello world\n");
  return 0;
}

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I saved it as testing.c then I go to terminal and compile it
gcc testing.c

then it gives me the following error:
testing.c:1:19: error: stdio.h: No such file or directory
testing.c: In function ‘main’:
testing.c:5: warning: incompatible implicit declaration of built-in function ‘printf’

how come...?

I know nothing about Apple products, such as Mac OS, so I can't provide specifics. However, you get this message because you don't have the development packages installed or setup properly. On Linux (Ubuntu in particular), you can install the "build-essentials" package I think it is called. Maybe try re-installing XCode, ensuring "all" features/libraries/development tools are also installed. Otherwise, search around for what required development package you need to install, specific to your OS.

Quote:

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having trouble to print helo world....

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This is the world where everyone has helo-copters, right? :p :p