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  1. #include <iostream>
  2. using namespace std;
  3. typedef union multytype mt;
  4. enum types
  5. {
  6. NONE,
  7. INT,
  8. DOUBLE,
  9. CHAR,
  10. STRING,
  11. CONSTSTRING
  12. };
  13.  
  14. union multytype
  15. {
  16.         types type;
  17.         struct { types type; int val;    } ival;
  18.         struct { types type; double val; } dval;
  19.         struct { types type; char val;   } cval;
  20.         struct { types type; char *val;  } sval;
  21.         struct { types type; const char *val;  } csval;
  22.         multytype()
  23.         {
  24.                 type=NONE;
  25.         }
  26.         multytype(int val)
  27.         {
  28.                 type=INT;
  29.                 ival.val=val;
  30.         }
  31.         multytype(double val)
  32.         {
  33.                 type=DOUBLE;
  34.                 dval.val=val;
  35.         }
  36.         multytype(char val)
  37.         {
  38.                 type=CHAR;
  39.                 cval.val=val;
  40.         }
  41.         multytype(char* val)
  42.         {
  43.                 type=STRING;
  44.                 sval.val=val;
  45.         }
  46.         multytype(const char* val)
  47.         {
  48.                 type=CONSTSTRING;
  49.                 csval.val=val;
  50.         }
  51. };
  52.  
  53. void print(int n, ... )
  54. {
  55.         mt* i=(mt*)((&n)+1);
  56.         for(int j=0;j<n;j++,i++)
  57.         {
  58.                 switch(i->type)
  59.                 {
  60.                 case INT:
  61.                         cout<< i->ival.val <<endl;
  62.                         break;
  63.                 case DOUBLE:
  64.                         cout<< i->dval.val <<endl;
  65.                         break;
  66.                 case CHAR:
  67.                         cout<< i->cval.val <<endl;
  68.                         break;
  69.                 case STRING:
  70.                         cout<< i->sval.val <<endl;
  71.                         break;
  72.                 case CONSTSTRING:
  73.                         cout<< i->csval.val <<endl;
  74.                         break;
  75.                 }
  76.         }
  77. }
  78.  
  79. int main()
  80. {
  81.         char str[]="Hi";
  82.         print(5,mt(2),mt(4.2),mt('a'),mt("Hello"),mt(str));
  83. }
Runtime error #stdin #stdout 0.02s 2720KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/klruj
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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