bash_n_examples/lang/hello.c

   1 #include <stdio.h>
   2 #include <string.h>
   3
   4 void say_goodbye(){
   5     printf("Goodbye\n");
   6 }
   7
   8 struct mystruct_t{
   9     int value;
  10     char letter;
  11     char* string;
  12     struct{
  13         float fp;
  14         struct{
  15             double dbl;
  16         };
  17     };
  18     void* ptr;
  19     size_t struct_size;
  20 };
  21
  22 int main(void) {
  23     printf("Hello World\n");
  24
  25     int retval = 1;
  26
  27     struct mystruct_t s;  // sizeof(struct mystruct_t) bytes are allocated for s, but still contain garbage
  28     s.value = 100;
  29     s.string = "pass";
  30     s.letter = 'P';
  31     s.fp = 123.4;
  32     s.dbl = 567.8;
  33     s.ptr = say_goodbye;  // address of function
  34     s.ptr = &say_goodbye;  // also address of function
  35     s.struct_size = sizeof(struct mystruct_t);
  36
  37     for(int i=0; i < 2; i++){
  38         printf("i is %d\n", i);
  39     }
  40
  41     if(!strcmp(s.string, "pass")){
  42         retval = 0;
  43     }
  44
  45     printf("returning %d\n", retval);
  46     say_goodbye();
  47     return retval;
  48 }