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  1. #include <stdio.h>
  2.  
  3. int main(void)
  4. {
  5.   printf("Hello Worldn");
  6.   return 0;
  7. }
  8.    
  9. #include <stdio.h>
  10. int main(void)
  11. {
  12.     puts("Hello World!");
  13. }
  14.    
  15. #include <stdio.h>
  16.  
  17. #ifndef HELLO_STRING
  18. #define HELLO_STRING "Hello, world!"
  19. #endif
  20.  
  21. int main(int argc, char *argv[], char *envp[])
  22. {
  23.     puts(HELLO_STRING);
  24.     return 0;
  25. }
  26.    
  27. #include <stdio.h>
  28.  
  29. int main(int argc, char** argv)
  30. {
  31.   printf("Hello Worldn");
  32.   return 0;
  33. }
  34.    
  35. #include <stdio.h>
  36. #include <stdlib.h>
  37. #include <errno.h>
  38.  
  39. extern int errno;
  40. extern FILE *stdout;
  41.  
  42. int main(int argc, char** argv)
  43. {
  44.   errno = 0;
  45.  
  46.   int err = printf("Hello Worldn");
  47.  
  48.   if (err < 0) {
  49.     return EXIT_FAILURE;
  50.   }
  51.  
  52.   err = fflush(stdout);
  53.  
  54.   if (err < 0 || errno != 0) {
  55.     return EXIT_FAILURE;
  56.   } else {
  57.     return EXIT_SUCCESS;
  58.   }
  59. }
  60.    
  61. #error Hello World
  62.    
  63. $ cat hello.c
  64. #include <stdio.h>
  65.  
  66. int main(void)
  67. {
  68.     printf("Hello world!n");
  69. }
  70.  
  71. $ c99 hello.c
  72. $ ./a.out
  73. Hello world!
  74. $
  75.    
  76. #include <stdio.h>
  77. main()
  78. {
  79.     printf("hello, worldn");
  80. }
  81.    
  82. #include <stdlib.h>
  83.  
  84. int main()
  85. {
  86.   system("echo Hello World!");
  87.   return 0;
  88. }
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