mac systems, how to compile and run. m file

Well everyone, brother just started learning objective-c,
Very depressed, in mac terminal, what command can compile and run. M file it,
For example, I now have a 123.m

 
# Import  

int main (int argc, const char * argv []) 
{
NSLog (@ "hello, LI Jialin!"); 
return (0); 
} 

Reply:
Have a look Shuba,. M file is the right method file
Reply:
gcc hello.m-o hello-ObjC-framework Foundation
Reply:

reference to the second floor nongmin reply:

gcc hello.m-o hello-ObjC-framework Foundation

Finally will, thank you, but also to ask me where this bit of code is wrong it

 
# Import  

int main () 
{
char * word [5]; 

FILE * fin = fopen ("/ 123.txt", "r"); 

char temp [100]; 
int counter = 0; 
while (fgets (temp, 100, fin)) 
{
temp [strlen (temp-1)] = '\ 0'; 
word [counter] = temp; 
counter + +; 
} 

for (int i = 0; i <5; i + +) 
{
NSLog (@ "% s's length is% d", word [i], strlen (word [i])); 
} 
return (0); 
}