Thread: having trouble to print helo world....

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

Code:

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

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.

having trouble to print helo world....

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