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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4. #include <unistd.h>
  5.  
  6. #define setarr(a)  [sizeof(a)-1] = (a) // remove NULL from end of string 
  7.  
  8. void my_char_plus(const void *a, const void *b, void *c)
  9. {
  10.   char tmp =  (*(char*)a + *(char*)b);
  11.   memcpy(c,(void*)(&tmp),sizeof(char));
  12. }
  13.  
  14. void my_char_minus(const void *a, const void *b, void *c)
  15. {
  16.   char tmp =  (*(char*)a - *(char*)b);
  17.   memcpy(c,(void*)(&tmp),sizeof(char));
  18. }
  19.  
  20.  
  21.  
  22. void operation(const void *funct(const void*,const void*,void*),
  23.                       const void *a, const void *b, void *c )
  24. {
  25.   funct(a,b,c);
  26. }
  27.  
  28. char ret_last_arg(const void *funct(const void*,const void*,void*),
  29.                       const void *a, const void *b)
  30. {
  31.   char c;
  32.   funct(a,b,(void*)&c);
  33.   return c;
  34. }
  35.  
  36.  
  37.  
  38. int main(void)
  39. {
  40.  
  41.   char a, b;
  42.   a = 5; b = 7;
  43.  
  44.  
  45.   void *plus = &my_char_plus; char c;
  46.   operation(plus, (const void*)&a, (const void*)&b, (void*)&c);
  47.   printf("5 + 7 = %i\n", c);
  48.  
  49.  
  50.   void *minus = &my_char_minus;
  51.   char d = ret_last_arg(minus, (const void*)&a, (const void*)&b);
  52.   printf("5 - 7 = %i\n", d);
  53.  
  54.  
  55. // LISP LISP LISP
  56. #define LISP(ar,aa,bb) ret_last_arg(ar, (const void*)&(char){aa}, (const void*)&(char){bb} )
  57.  
  58.   char e = LISP(plus,2,LISP(plus,2,2));
  59.   printf("( + 2 ( + 2 2 ) = %i\n", e);
  60.  
  61.   return 0;
  62. }
Success #stdin #stdout 0s 1788KB
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stdin
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Standard input is empty
stdout
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5 + 7 = 12
5 - 7 = -2
( + 2 ( + 2 2 ) = 6
https://ideone.com/l5cpwf
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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