Linux之Hello World

1　　Source code for hello.c

1 /* hello.c */
2 #include <stdlib.h>
3 #include <stdio.h>
4
5 int main()
6 {
7   printf("Hello World!\n");
8   exit(0);
9 }

2　　Compile, link and run

$ gcc -o hello hello.c
$ ./hello
Hello World!

If you forget the -o name option that tells the compiler where to place the executable, it will place the program in a file called a.out (meaning assembler output).